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