Income Taxes Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Abstract]
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate	$ 22,574	$ 30,117	$ 40,870
Income Tax Reconciliation, State and Local Income Taxes	178	1,135	4,022
Income Tax Reconciliation, Tax Exempt Income	(7)	(7)	(6)
Income Tax Reconciliation, Tax Contingencies	(1,208)	(1,473)	(1,006)
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Deferred TaxLiability, Provisional Income Tax (Expense) Benefit	(32,789)	0	0
Income Tax Reconciliation, Other Adjustments	577	(109)	(165)
Income Tax Expense (Benefit)	$ (10,675)	$ 29,663	$ 43,715