Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2016

Commitments and Contingencies Disclosure [Abstract]

Future Minimum Rental Commitments under Office and Equipment Leases

Future minimum rental commitments under such office and equipment leases as of December 31, 2016 are as follows:

(Expressed in thousands)
2017	$	40,751
2018	39,204
2019	34,149
2020	26,150
2021	22,341
2022 and thereafter	100,402
	$	262,997