Income Taxes, Current and Deferred Amounts of Income Tax Expense Table (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal	$ 20,246	$ 76,525	$ 73,781
State	12,593	11,576	2,885
Total current	32,839	88,101	76,666
Deferred:
Federal	34,941	19,755	3,338
State	12,006	1,647	7,318
Total deferred	46,947	21,402	10,656
Total income tax expense	$ 79,786	$ 109,503	$ 87,322