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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2012
Future Minimum Rental Commitments under Office and Equipment Leases | Future minimum rental commitments under such office and equipment leases as at December 31, 2012 are as follows. Expressed in thousands of dollars.
2013 |  | $ | 41,595 |
2014 |  |  | 38,894 |
2015 |  |  | 33,473 |
2016 |  |  | 29,407 |
2017 |  |  | 25,849 |
2018 and thereafter |  |  | 153,482 |
Total |  | $ | 322,700 |

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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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