Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt (Details)

v3.5.0.2
Long-Term Debt (Details)
$ / shares in Units, $ in Thousands, € in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
$ / shares
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
$ / shares
Sep. 30, 2016
EUR (€)
Sep. 30, 2015
USD ($)
May 24, 2016
USD ($)
Apr. 21, 2016
EUR (€)
Dec. 31, 2015
$ / shares
Debt Instrument [Line Items]                  
Common Stock, par value | $ / shares   $ 0.01   $ 0.01         $ 0.01
Stock Repurchase Program, Remaining Authorized Repurchase Amount   $ 64,800   $ 64,800          
Debt extinguishment gains   557 $ (434) 5,395   $ (29,970)      
Letters of Credit Outstanding, Amount   26,200   26,200          
Guarantor Obligations, Maximum Exposure, Undiscounted   $ 1,600   $ 1,600          
Seven Point Three Seven Five Percentage Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Interest Rate, Stated Percentage   7.375%   7.375%          
Debt Instrument, Repurchased Face Amount   $ 22,600   $ 22,600          
Debt Instrument, Repurchase Amount   20,300   20,300          
Debt extinguishment gains       2,100          
Senior Notes, Noncurrent   $ 173,400   $ 173,400          
Three Point Zero Percentage Convertible Notes [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Interest Rate, Stated Percentage   3.00%   3.00%          
Two Point Five Percentage Convertible Notes [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Interest Rate, Stated Percentage   2.50%   2.50%          
Debt Instrument, Repurchased Face Amount   $ 117,400   $ 117,400          
Convertible Debt   167,100   167,100          
Debt Instrument, Repurchase Amount   $ 114,900   114,900          
Debt extinguishment gains       3,300          
Other Debt Obligations [Member]                  
Debt Instrument [Line Items]                  
Repayments of long-term debt       2,500          
Proceeds from Issuance of Debt       7,500          
Payments of Debt Issuance Costs       100          
Windcat Workboats Ltd. [Member] | Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Proceeds from Lines of Credit       23,500 € 21.0        
Line of Credit Facility, Current Borrowing Capacity             $ 25,000    
Payments of Debt Issuance Costs       600          
Windcat Workboats Ltd. [Member] | Other Debt Obligations [Member]                  
Debt Instrument [Line Items]                  
Repayments of Other Debt       $ 22,900          
Sea-Cat Crewzer III [Member]                  
Debt Instrument [Line Items]                  
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate   2.76%   2.76%          
Debt Instrument, Fee       0.0045 0.0045        
Proceeds from Issuance of Debt       $ 16,100          
Payments of Debt Issuance Costs       2,600          
Debt Instrument, Face Amount | €               € 27.6  
Sea-Vista [Member] | Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Proceeds from Lines of Credit       71,000          
Line of Credit Facility, Current Borrowing Capacity   $ 16,000   16,000          
Sea-Vista [Member] | Term A-1 Loan [Member]                  
Debt Instrument [Line Items]                  
Repayments of long-term debt       2,900          
Illinois Corn Processing LLC [Member] | Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Line of Credit Facility, Current Borrowing Capacity   15,900   15,900          
Long-term Debt [Member] | Two Point Five Percentage Convertible Notes [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Repurchase Amount   107,800   107,800          
Additional Paid-In Capital [Member] | Two Point Five Percentage Convertible Notes [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Repurchase Amount   $ 7,100   $ 7,100          
Subsequent Event [Member] | Sea-Vista [Member] | Revolving Credit Facility [Member]                  
Debt Instrument [Line Items]                  
Proceeds from Lines of Credit $ 5,000                
Minimum [Member] | Windcat Workboats Ltd. [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Fee       0.012 0.012        
Maximum [Member] | Windcat Workboats Ltd. [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Fee       0.0132 0.0132        
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Windcat Workboats Ltd. [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Basis Spread on Variable Rate       3.00% 3.00%        
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Windcat Workboats Ltd. [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Basis Spread on Variable Rate       3.30% 3.30%