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Commitments and Contingencies (Tables)
3 Months Ended
Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]  
Future Minimum Lease Commitments
The future minimum lease commitments under these leases at March 31, 2015 are as follows (in thousands):
Nine months ending December 31, 2015
$
105,778

Years ending December 31:
 
2016
124,164

2017
103,909

2018
84,474

2019
67,437

2020
55,408

Thereafter
205,658

Future Minimum Lease Payments
$
746,828