Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Effective Income Tax Rate, Percent	39.40%	37.50%	32.80%	33.40%
Valuation Allowance [Abstract]
Valuation Allowance, Amount	$ 0		$ 0		$ 0
Income Tax Uncertainties [Abstract]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	3,900		3,900		5,700
Unrecognized Tax Benefits, Period Increase (Decrease)	(100)	$ 100	(2,900)	$ (2,000)
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	1,900		1,900		$ 3,200
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	0		(1,300)
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance beginning of period			8,751
Additions based on tax positions related to current year			188
Additions for tax positions of prior years			0
Reductions for tax positions of prior years			(415)
Reductions due to lapse of applicable statute of limitations			(2,699)
Settlements			(17)
Balance end of period	5,808		5,808
Maximum [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Lower Bound	(2,300)		(2,300)
Minimum [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Lower Bound	$ (1,300)		$ (1,300)