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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Schedule of future minimum rentals due under non-cancelable leases
Future minimum rentals due under non-cancelable leases are as follows for each of the years ending December 31, (in thousands):
2018
$
3,449

2019
3,423

2020
3,449

2021
3,458

2022
3,469

Thereafter
158,176

Total
$
175,424