Income Taxes Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current tax expense:
Federal	$ 35,783	$ 19,553	$ 33,872
State	5,352	2,617	1,698
Total	41,135	22,170	35,570
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal	(16,841)	39,885	7,968
State	283	646	3,086
Total	(16,558)	40,531	11,054
Total income tax expense	$ 24,577	$ 62,701	$ 46,624