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Other Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Other Commitments and Contingencies [Abstract]  
Schedule of Future Minimum Payments Due Under Non-Cancelable Leases

Future minimum rents payable as of December 31, 2017 under non-cancelable leases with initial terms exceeding one year are as follows (in thousands):

2018$23,168
201918,228
202014,122
20218,652
2022 and thereafter25,512
Total$89,682