Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2014

Commitments and Contingencies Disclosure [Abstract]

Lease arrangements

The following is a schedule of future minimum rental payments, exclusive of escalation clauses, on non-cancelable leases at December 31, 2014 (in thousands of U.S. dollars):

Year	Amount
2015	$	27,393
2016	26,092
2017	25,509
2018	12,358
2019	5,068
2020 through 2022	685
Total future minimum rental payments	$	97,105
Total future sub-lease rental income through 2019	$	5,253