Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements (Non-Financial Assets And Liabilities Measured At Fair Value) (Details)

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Fair Value Measurements (Non-Financial Assets And Liabilities Measured At Fair Value) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2017
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Provision for Loan and Lease Losses $ 6,700    
SCFCo Holdings      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity Method Investment, Other than Temporary Impairment $ 7,700 $ 21,500  
Fair Value Inputs, Earnings before Interest, Taxes, Depreciation, and Amortization Multiple 7    
SeaJon II [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Business Combination, Separately Recognized Transactions, Net Gains and Losses $ 1,900    
Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity Method Investments, Fair Value Disclosure 0   $ 0
Loans Receivable, Fair Value Disclosure 0    
Property, Plant, and Equipment, Fair Value Disclosure 0    
Goodwill, Fair Value Disclosure 0    
Cost Method Investments, Fair Value Disclosure 0    
Notes Receivable, Fair Value Disclosure 10,000   943
Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity Method Investments, Fair Value Disclosure 3,438   6,000
Loans Receivable, Fair Value Disclosure 0    
Property, Plant, and Equipment, Fair Value Disclosure 800    
Goodwill, Fair Value Disclosure 0    
Cost Method Investments, Fair Value Disclosure 3,600    
Notes Receivable, Fair Value Disclosure 2,206   1,642
Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity Method Investments, Fair Value Disclosure 29,611   0
Loans Receivable, Fair Value Disclosure 0    
Property, Plant, and Equipment, Fair Value Disclosure 0    
Goodwill, Fair Value Disclosure 28,506    
Cost Method Investments, Fair Value Disclosure 0    
Notes Receivable, Fair Value Disclosure 0   $ 0
Witt O'Brien's LLC [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Goodwill, Impairment Loss 19,600    
Cost-method Investments [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cost-method Investments, Other than Temporary Impairment $ 11,600