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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Statement [Abstract]        
Revenues $ 513,012,000 $ 448,962,000 $ 1,522,884,000 $ 1,340,021,000
Operating expenses        
Direct cost of revenues 336,477,000 294,851,000 987,912,000 907,994,000
Selling, general and administrative expenses 117,448,000 104,161,000 347,473,000 319,970,000
Special charges 0 0 0 30,074,000
Amortization of other intangible assets 1,975,000 2,882,000 6,297,000 7,797,000
Operating expenses 455,900,000 401,894,000 1,341,682,000 1,265,835,000
Operating income 57,112,000 47,068,000 181,202,000 74,186,000
Other income (expense)        
Interest income and other 1,400,000 1,103,000 2,074,000 3,300,000
Interest expense (7,246,000) (6,760,000) (20,073,000) (18,811,000)
Gain on sale of business 13,031,000 0 13,031,000 0
Other income (expense) 7,185,000 (5,657,000) (4,968,000) (15,511,000)
Income before income tax provision 64,297,000 41,411,000 176,234,000 58,675,000
Income tax provision 19,964,000 9,197,000 49,347,000 17,601,000
Net income $ 44,333,000 $ 32,214,000 $ 126,887,000 $ 41,074,000
Earnings per common share — basic (in dollars per share) $ 1.19 $ 0.86 $ 3.43 $ 1.05
Earnings per common share — diluted (in dollars per share) $ 1.14 $ 0.85 $ 3.32 $ 1.03
Other comprehensive income (loss), net of tax        
Foreign currency translation adjustments, net of tax expense of $373, $—, $373 and $— $ (4,180,000) $ 11,234,000 $ (17,417,000) $ 28,778,000
Total other comprehensive income (loss), net of tax (4,180,000) 11,234,000 (17,417,000) 28,778,000
Comprehensive income $ 40,153,000 $ 43,448,000 $ 109,470,000 $ 69,852,000