Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	35.00%
Deferred Income Tax Expense (Benefit)	$ 2,757	$ (27,177)	$ (5,455)
PortionOfTaxBenefitRecordedPositionsMoreLikelyThanNotToBeSustained	50.00%
Income Tax Uncertainties [Abstract]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 3,600	4,800
Unrecognized Tax Benefits, Period Increase (Decrease)	(1,300)	(2,900)
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	1,000	2,300
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	(1,400)	(900)	(1,500)
Decrease in Unrecognized Tax Benefits is Reasonably Possible	(700)
Increase in Unrecognized Tax Benefits is Reasonably Possible	300
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance beginning of period	5,839	8,751
Additions based on tax positions related to current year	700	135
Reductions for tax positions of prior years	0	(331)
Reductions due to lapse of applicable statute of limitations	(1,954)	(2,699)
Settlements	0	(17)
Balance end of period	4,585	5,839	$ 8,751
Valuation Allowance [Abstract]
Valuation Allowance, Amount	$ 0	$ 0