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Condensed Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Statement [Abstract]    
Operating revenues $ 351,316 $ 301,207
Operating expenses:    
Cost of revenues 71,304 67,463
Selling and marketing 46,409 42,972
Research and development 20,707 18,970
General and administrative 26,187 20,981
Amortization of intangible assets 11,338 11,251
Depreciation and amortization of property, equipment and leasehold improvements 8,205 8,838
Total operating expenses 184,150 170,475
Operating income 167,166 130,732
Interest income (2,770) (932)
Interest expense 29,560 29,024
Other expense (income) 938 1,015
Other expense (income), net 27,728 29,107
Income before provision for income taxes 139,438 101,625
Provision for income taxes 24,346 28,674
Net income $ 115,092 $ 72,951
Earnings per basic common share $ 1.28 $ 0.80
Earnings per diluted common share $ 1.24 $ 0.80
Weighted average shares outstanding used in computing earnings per share    
Basic 90,075 90,708
Diluted 92,587 91,624
Dividend declared per common share $ 0.38 $ 0.28