Income Taxes Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Components of Income Tax Expense (Benefit) [Line Items]
Current Income Tax Expense (Benefit)	$ 1,168	$ (153)	$ (1,604)
Deferred Income Tax Expense (Benefit)	(10,815)	0	0
Federal Income Tax Expense (Benefit), Continuing Operations	$ (9,647)	$ (153)	$ (1,604)