Commitments and Contingencies (Summary of Future Lease Payments Under Non-Cancelable Capital and Operating Leases (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Capital
2017	$ 1,463
2018	1,158
2019	869
2020	531
2021	523
Thereafter	3,983
Total payments	8,527
Less amount representing interest	1,506
Present value of capitalized lease payments	7,021
Operating
2017	99,091
2018	75,238
2019	54,187
2020	36,811
2021	20,535
Thereafter	17,612
Total payments	303,474
Total Future Payments
2017	100,554
2018	76,396
2019	55,056
2020	37,342
2021	21,058
Thereafter	21,595
Total payments	$ 312,001