Commitments (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]
Operating lease term (more than one year)	1 year
Lease Commitments, 2015	$ 22,187
Lease Commitments, 2016	17,952
Lease Commitments, 2017	15,772
Lease Commitments, 2018	13,674
Lease Commitments, 2019	9,981
Lease Commitments, Thereafter	25,078
Lease Commitments, Total	104,644
Sublease Rentals, 2015	111
Sublease Rentals, 2016	0
Sublease Rentals, 2017	0
Sublease Rentals, 2018	0
Sublease Rentals, 2019	0
Sublease Rentals, Thereafter	0
Sublease Rentals, Total	111
Net, 2015	22,076
Net, 2016	17,952
Net, 2017	15,772
Net, 2018	13,674
Net, 2019	9,981
Net, Thereafter	25,078
Net, Total	104,533
Rental expense	$ 22,516	$ 6,523	$ 4,100