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Commitments and Contingencies (Tables)
9 Months Ended
Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]  
Future Minimum Lease Commitments
The future minimum lease commitments under these leases at September 30, 2017 are as follows (in thousands):
Three months ending December 31, 2017
$
61,817

Years ending December 31:
 
2018
221,493

2019
179,078

2020
143,199

2021
108,044

2022
85,547

Thereafter
539,398

Future Minimum Lease Payments
$
1,338,576