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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]  
Schedule of future minimum lease payments under non-cancelable operating leases
Future minimum lease payments under non-cancelable operating leases as of December 31, 2016 are as follows (in thousands of dollars):
Year Ending December 31,
Amounts
2017
$
2,143

2018
2,102

2019
2,026

2020
2,082

2021
2,144

Thereafter
9,812

Total minimum lease payments
$
20,309