Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Examination [Line Items]
Federal									$ 22,916	$ 9,399	$ 24,029
State and local									2,798	195	2,890
Current Federal, State and Local, Tax Expense (Benefit)									25,714	9,594	26,919
Deferred:									(5,763)	4,277	(9,943)
Deferred Federal Income Tax Expense (Benefit)									(5,266)	3,908	(9,393)
Deferred State and Local Income Tax Expense (Benefit)									(497)	369	(550)
Deferred Federal, State and Local, Tax Expense (Benefit)									(5,763)	4,277	(9,943)
Total income tax expense	$ 5,445	$ 4,722	$ 4,762	$ 5,022	$ 2,812	$ 4,388	$ 3,664	$ 3,007	$ 19,951	$ 13,871	$ 16,976