Income Taxes Income Tax Expense Detail (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Abstract]
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ 3,200	$ 4,700
Current Federal Tax Expense (Benefit)	34,664	33,364	$ 6,860
Current State and Local Tax Expense (Benefit)	454	2,703	855
Current Income Tax Expense (Benefit)	35,118	36,067	7,715
Deferred Federal Income Tax Expense (Benefit)	(5,291)	5,170	36,706
Deferred State and Local Income Tax Expense (Benefit)	(164)	2,478	2,362
Deferred Income Tax Expense (Benefit)	(5,455)	7,648	39,068
Income Tax Expense (Benefit)	$ 29,663	$ 43,715	$ 46,783