Income Taxes Components of Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Current Income Tax Expense									$ 5,542	$ (49,569)	$ 14,454
Deferred Income Tax Expense									1,573	62,633	20,687
Federal income tax expense	$ (23)	$ 86	$ 1,242	$ 5,810	$ (596)	$ 12,671	$ (1,553)	$ 2,542	$ 7,115	$ 13,064	$ 35,141