Commitments and Contingencies (Summary of Future Lease Payments Under Non-Cancelable Capital and Operating Leases (Details) $ in Thousands	Dec. 31, 2015 USD ($)
Capital
2016	$ 1,385
2017	1,257
2018	1,139
2019	972
2020	555
Thereafter	4,537
Total payments	9,845
Less amount representing interest	1,913
Present value of capitalized lease payments	7,932
Operating
2016	95,407
2017	76,748
2018	54,306
2019	34,907
2020	20,263
Thereafter	15,454
Total payments	297,085
Total Future Payments
2016	96,792
2017	78,005
2018	55,445
2019	35,879
2020	20,818
Thereafter	19,991
Total payments	$ 306,930