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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Commitments and Contingencies (Tables) [Abstract]  
Future minimum lease payments due under operating and capital leases

At December 31, 2017, future minimum lease payments due under operating and capital leases are as follows (in thousands):

Operating LeasesCapital Leases(1)
2018$17,871$4,678
201918,0704,334
202017,6054,173
202117,4194,173
202216,7654,173
Thereafter1,037,36867,573
Totals$1,125,098$89,104
(1) Amounts above represent principal and interest obligations under capital lease arrangements. Related assets with a gross value of $167,324,000 and accumulated depreciation of $29,303,000 are recorded in real property.