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Commitments and Contingencies (Tables)
3 Months Ended
Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Future Minimum Lease Commitments
The future minimum lease commitments under these leases at March 31, 2018 are as follows (in thousands):
Nine months ending December 31, 2018
$
186,038

Years ending December 31:
 
2019
207,724

2020
171,530

2021
132,755

2022
107,405

2023
91,007

Thereafter
532,760

Future Minimum Lease Payments
$
1,429,219