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Income Taxes (Composition of Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current taxes
Federal	$ (2,230)	$ (15,747)	$ 16,709
State	(187)	(486)	751
Current taxes	(2,417)	(16,233)	17,460
Deferred taxes
Federal	(4,703)	23,869	(2,767)
State	(1,721)	(1,146)	88
Deferred taxes	(6,424)	22,723	(2,679)
Tax (benefit) expense related to a (decrease) increase in unrecognized tax benefits	(57)	(1,120)	59
Interest expense, gross of related tax effects	53	(1,906)	(9)
Total (benefit) provision	$ (8,845)	$ 3,464	$ 14,831

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