Income Taxes Benefit From Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current Federal Tax Expense (Benefit)	$ 33,392	$ 1,745	$ 1,757
Current State and Local Tax Expense (Benefit)	2,414	2,120	883
Current Income Tax Expense (Benefit)	35,806	3,865	2,640
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred Federal Income Tax Expense (Benefit)	11,916	28,335	28,760
Deferred State and Local Income Tax Expense (Benefit)	521	2,976	3,766
Deferred Income Tax Expense (Benefit)	12,437	31,311	32,526
Provision (benefit) from income taxes	$ 48,243	$ 35,176	$ 35,166