Commitments and Contingencies Commitments and Contingencies (Summary of Future Lease Payments Under Non-Cancelable Capital and Operating Leases (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
2014 capital leases	$ 771
2015 capital leases	458
2016 capital leases	462
2017 capital leases	266
2018 capital leases	41
Capital leases thereafter	0
Total payments for capital leases	1,998
Less amount representing interest	173
Present value of capitalized lease payments	1,825
2014 operating leases	96,694
2015 operating leases	78,301
2016 operating leases	50,415
2017 operating leases	35,239
2018 operating leases	21,644
Operating leases thereafter	31,132
Total payments for operating leases	313,425
2014 total future payments	97,465
2015 total future payments	78,759
2016 total future payments	50,877
2017 total future payments	35,505
2018 total future payments	21,685
Total future payments due thereafter	31,132
Total future payments due	$ 315,423