Income Taxes (Uncertain Tax Positions) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Unrecognized tax benefits, income tax penalties and interest accrued	$ 200	$ 500	$ 300
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1	2,996	2,441	2,302
Additions based on current year tax positions	211	117	512
Changes for tax positions of prior years			33
Changes for tax positions of prior years	(96)	(160)
Settlements	(155)		(165)
Settlements		19
Additions due to acquired business	0	954	0
Reductions due to lapses in statutes of limitation	(124)	(375)	(241)
Balance at December 31	2,832	2,996	2,441
Unrecognized tax benefits that would impact effective tax rate	2,200
Unrecognized tax benefits, income tax penalties and interest expense ($0.1 million or less)	100	100	100
Income taxes paid, net	$ 24,800	$ 35,700	$ 22,800