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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Income Statement [Abstract]        
Revenues $ 593,106 $ 513,012 $ 1,750,499 $ 1,522,884
Operating expenses        
Direct cost of revenues 380,892 336,477 1,116,224 987,912
Selling, general and administrative expenses 127,951 117,448 371,042 347,473
Amortization of other intangible assets 2,125 1,975 5,838 6,297
Operating expenses 510,968 455,900 1,493,104 1,341,682
Operating income 82,138 57,112 257,395 181,202
Other income (expense)        
Interest income and other 2,973 1,400 5,741 2,074
Interest expense (4,832) (7,246) (14,371) (20,073)
Gain on sale of business 0 13,031 0 13,031
Other income (expense) (1,859) 7,185 (8,630) (4,968)
Income before income tax provision 80,279 64,297 248,765 176,234
Income tax provision 19,857 19,964 61,100 49,347
Net income $ 60,422 $ 44,333 $ 187,665 $ 126,887
Earnings per common share — basic (in dollars per share) $ 1.65 $ 1.19 $ 5.09 $ 3.43
Earnings per common share — diluted (in dollars per share) $ 1.59 $ 1.14 $ 4.92 $ 3.32
Other comprehensive loss, net of tax        
Foreign currency translation adjustments, net of tax expense of $0, $373, $0 and $373 $ (16,633) $ (4,180) $ (16,225) $ (17,417)
Total other comprehensive loss, net of tax (16,633) (4,180) (16,225) (17,417)
Comprehensive income $ 43,789 $ 40,153 $ 171,440 $ 109,470