Income Taxes Table of the Reconciliation of the Expected Federal Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent									6.00%
Net income (loss) before taxes from continuing operations	$ 1,432	$ (3,895)	$ (4,905)	$ 4,038	$ 16,082	$ 12,023	$ 12,201	$ 8,834	$ (3,330)	$ 49,140	$ (2,904)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent									35.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount									$ (1,166)	$ 17,199	$ (1,016)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount									15,238	0	0
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount									1,018	446	(637)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount									219	(18)	(48)
Effective Income Tax Rate Reconciliation, Effect of Permanent Differences, Amount									(144)	228	58
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount									2,314	(641)	(1,142)
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount									0	4,044	0
Effective Income Tax Rate Reconciliation, Deferred Tax True-ups, Amount									(5)	118	(897)
Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Amount									(400)	(380)	2,331
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount									840	(393)	598
Federal Income Tax Expense (Benefit), Continuing Operations									$ (12,562)	$ 12,515	$ (753)
Effective Income Tax Rate Reconciliation, Percent									377.20%	25.50%	25.90%