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Commitments and Contingencies Capital Lease Financing Obligations (Details)
$ in Thousands
Dec. 31, 2015
USD ($)
Capital Leases, Future Minimum Payments Due [Abstract]  
2016 $ 18,773
2017 19,248
2018 19,146
2019 6,719
2020 1,089
Thereafter 209
Total payments 65,184
Less: amount representing interest (6,716)
Present value of payments 58,468
Letter of credit, amount outstanding $ 21,900
Minimum  
Capital Leased Assets  
Effective interest rate (less than) (percentage) 1.00%
Maximum  
Capital Leased Assets  
Effective interest rate (less than) (percentage) 9.00%