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Consolidated Statements of Earnings - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Revenues $ 2,275,362 $ 1,896,724
Cost of revenues (exclusive of depreciation and amortization shown below) 1,427,281 1,179,773
Selling, general and administrative expenses 613,335 522,295
Depreciation 26,334 23,631
Amortization of intangible assets 26,658 21,293
Acquisition-related items (note 4) 14,927 3,559
Operating earnings 166,827 146,173
Interest expense, net 11,895 9,190
Other income, net (note 5) (500) (2,417)
Earnings before income tax 155,432 139,400
Income tax (note 15) 63,300 47,829
Net earnings 92,132 91,571
Non-controlling interest share of earnings 20,236 20,085
Non-controlling interest redemption increment (note 12) 22,583 3,521
Net earnings attributable to Company $ 49,313 $ 67,965
Net earnings per common share (note 17)    
Continuing operations (Diluted) (in dollars per share) $ 1.27 $ 1.76
Diluted (in dollars per share) $ 1.25 $ 1.75