Commitments and Contingencies (Summary of Future Lease Payments Under Non-Cancelable Capital and Operating Leases (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Capital
2019	$ 1,494
2020	1,195
2021	766
2022	562
2023	555
Thereafter	3,215
Total payments	7,787
Less amount representing interest	1,123
Present value of capitalized lease payments	6,664
Operating
2019	116,110
2020	93,724
2021	66,129
2022	42,247
2023	22,207
Thereafter	26,097
Total payments	366,514
Total Future Payments
2019	117,604
2020	94,919
2021	66,895
2022	42,809
2023	22,762
Thereafter	29,312
Total payments	$ 374,301

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