Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2015

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 and future sub-lease rental income on non-cancellable leases at December 31, 2015 (in thousands of U.S. dollars):

Year	Amount
2016	$	26,150
2017	25,312
2018	12,618
2019	5,601
2020	981
2021 through 2022	1,398
Total future minimum rental payments	$	72,060
Total future sub-lease rental income through 2019	$	7,360