Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Abstract]
PortionOfTaxBenefitRecordedPositionsMoreLikelyThanNotToBeSustained	50.00%
Income Tax Uncertainties [Abstract]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 5,700	$ 7,300
Unrecognized Tax Benefits, Period Increase (Decrease)	(2,800)	(1,100)
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	3,200	4,700
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	(1,500)	(1,000)	$ (1,000)
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Lower Bound	(1,800)
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Upper Bound	(2,800)
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance beginning of period	11,569	12,632
Additions based on tax positions related to current year	592	954
Additions for tax positions of prior years	0	0
Reductions for tax positions of prior years	(108)	(90)
Reductions due to lapse of applicable statute of limitations	(3,302)	(1,927)
Settlements	0	0
Balance end of period	8,751	11,569	12,632
Valuation Allowance [Abstract]
Valuation Allowance, Amount	0	0
Income Tax Reconciliation, Tax Contingencies	$ (1,473)	$ (1,006)	$ (993)