Commitments and Contingencies Commitments and Contingencies (Details) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2017		$ 10,460
2018		7,818
2019		6,354
2020		4,887
2021		1,702
Thereafter		1,320
Total minimum lease payments		32,541
Less: Amounts representing interest		(2,467)
Total obligation under capital leases		30,074
Less: Current portion of capital lease obligation		(9,493)
Long-term portion of capital lease obligation		20,581	$ 16,495
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2017		27,668
2018		22,894
2019		20,202
2020		14,351
2021		12,453
Thereafter		37,607
Total minimum lease payments	[1]	$ 135,175

[1] Minimum operating lease payments have not been reduced by minimum sublease rentals of $0.1 million due in the future under noncancelable subleases.