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Consolidated Statements of Comprehensive Income - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Statement [Abstract]      
Revenues $ 2,352,717,000 $ 2,027,877,000 $ 1,807,732,000
Operating expenses      
Direct cost of revenues 1,534,896,000 1,328,074,000 1,215,560,000
Selling, general and administrative expenses 504,074,000 465,636,000 432,013,000
Special charges 0 0 40,885,000
Amortization of other intangible assets 8,152,000 8,162,000 10,563,000
Costs and Expenses 2,047,122,000 1,801,872,000 1,699,021,000
Operating income 305,595,000 226,005,000 108,711,000
Other income (expense)      
Interest income and other 2,061,000 4,977,000 3,752,000
Interest expense (19,206,000) (27,149,000) (25,358,000)
Gain on sale of business 0 13,031,000 0
Loss on early extinguishment of debt 0 (9,072,000) 0
Other income (expense) (17,145,000) (18,213,000) (21,606,000)
Income before income tax provision 288,450,000 207,792,000 87,105,000
Income tax provision 71,724,000 57,181,000 (20,857,000)
Net income $ 216,726,000 $ 150,611,000 $ 107,962,000
Earnings per common share — basic (in dollars per share) $ 5.89 $ 4.06 $ 2.79
Earnings per common share — diluted (in dollars per share) $ 5.69 $ 3.93 $ 2.75
Other comprehensive income (loss), net of tax      
Foreign currency translation adjustments, net of tax expense of $—, $373 and $— $ 6,970,000 $ (27,602,000) $ 30,664,000
Other comprehensive income (loss), net of tax 6,970,000 (27,602,000) 30,664,000
Comprehensive income $ 223,696,000 $ 123,009,000 $ 138,626,000