Income Taxes - Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current [Abstract]
Federal	$ 10,355	$ 18,448	$ 17,761
State	2,698	2,166	2,068
Deferred [Abstract]
Federal	15,647	12,865	16,256
State	2,353	1,935	2,444
Income tax provision	$ 31,053	$ 35,414	$ 38,529