Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Payments for Repurchase of Common Stock			$ 14,678	$ 30,858
Effective Income Tax Rate, Percent	37.50%	39.40%	33.40%	37.00%
Valuation Allowance [Abstract]
Valuation Allowance, Amount	$ 0		$ 0
Income Tax Uncertainties [Abstract]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	6,000		6,000		$ 7,300
Unrecognized Tax Benefits, Period Increase (Decrease)	100	$ 200	(2,000)	$ (1,400)
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	3,100		3,100		$ 4,700
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense			(1,552)	$ (1,111)
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance beginning of period			11,569
Additions based on tax positions related to current year			474
Additions for tax positions of prior years			0
Reductions for tax positions of prior years			(108)
Reductions due to lapse of applicable statute of limitations			(2,374)
Settlements			0
Balance end of period	9,561		9,561
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	(2,200)		(2,200)
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	$ (1,200)		$ (1,200)