Annual report pursuant to Section 13 and 15(d)

Long-Term Debt (Schedule of Company's Borrowings) (Details)

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Long-Term Debt (Schedule of Company's Borrowings) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Long-term debt, gross $ 340,235 $ 386,059
Portion due within one year, net of unamortized discount and issue costs (58,854) (8,497)
Debt discount included in long-term debt (19,990) (28,334)
Debt issuance costs included in long-term debt (5,779) (3,100)
Long-term debt, excluding current maturities 255,612 346,128
Convertible Debt | 3.0% Convertible Senior Notes    
Debt Instrument [Line Items]    
Long-term debt, gross 50,041 107,284
Debt discount included in long-term debt (1,600) (7,200)
Debt issuance costs included in long-term debt (200) (700)
Convertible Debt | 2.5% Convertible Senior Notes    
Debt Instrument [Line Items]    
Long-term debt, gross 64,455 64,455
Convertible Debt | 3.25% Convertible Senior Notes    
Debt Instrument [Line Items]    
Long-term debt, gross 117,782 117,782
Debt discount included in long-term debt (18,400) (21,100)
Debt issuance costs included in long-term debt (1,600) (1,900)
Line of Credit | SEA-Vista 2015 Credit Facility    
Debt Instrument [Line Items]    
Long-term debt, gross 0 87,977
Debt issuance costs included in long-term debt   (400)
Line of Credit | SEA-Vista 2019 Credit Facility    
Debt Instrument [Line Items]    
Long-term debt, gross 100,000 0
Debt issuance costs included in long-term debt (2,100)  
Notes Payable, Other Payables    
Debt Instrument [Line Items]    
Long-term debt, gross 7,957 8,561
Debt issuance costs included in long-term debt $ (100) $ (100)