Commitments and Contingencies (Summary of Future Lease Payments Under Non-Cancelable Capital and Operating Leases (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
2015 capital leases	$ 441
2016 capital leases	448
2017 capital leases	323
2018 capital leases	26
2019 capital leases	10
Capital leases thereafter	0
Total payments for capital leases	1,248
Less amount representing interest	103
Present value of capitalized lease payments	1,145
2015 operating leases	96,873
2016 operating leases	69,875
2017 operating leases	51,811
2018 operating leases	32,985
2019 operating leases	21,164
Operating leases thereafter	24,404
Total payments for operating leases	297,112
2015 total future payments	97,314
2016 total future payments	70,323
2017 total future payments	52,134
2018 total future payments	33,011
2019 total future payments	21,174
Total future payments due thereafter	24,404
Total future payments due	$ 298,360