Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Effective Income Tax Rate, Percent	32.80%	33.50%	30.80%	31.60%
Valuation Allowance [Abstract]
Valuation Allowance, Amount	$ 0		$ 0		$ 0
Income Tax Uncertainties [Abstract]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	4,000		4,000		5,700
Unrecognized Tax Benefits, Period Increase (Decrease)	(1,200)	$ (1,300)	(2,900)	$ (1,700)
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	1,900		1,900		$ 3,200
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	(500)	$ (900)	(1,300)	$ (1,600)
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			145
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			(2,602)
Settlements			(17)
Balance end of period	5,862		5,862
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	(2,500)		(2,500)
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	$ (1,500)		$ (1,500)