Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Operating revenues	$ 2,043,544	$ 1,695,390	$ 1,557,796
Operating expenses:
Cost of revenues (exclusive of depreciation and amortization)	358,684	291,704	294,961
Selling and marketing	243,185	216,496	219,298
Research and development	111,564	101,053	98,334
General and administrative	147,893	114,627	110,093
Amortization of intangible assets	80,592	56,941	49,410
Depreciation and amortization of property, equipment and leasehold improvements	28,901	29,805	29,999
Total operating expenses	970,819	810,626	802,095
Operating income	1,072,725	884,764	755,701
Interest income	(1,497)	(5,030)	(16,403)
Interest expense	159,614	156,324	148,041
Other expense (income)	56,472	47,245	20,745
Other expense (income), net	214,589	198,539	152,383
Income before provision for income taxes	858,136	686,225	603,318
Provision for income taxes	132,153	84,403	39,670
Net income	$ 725,983	$ 601,822	$ 563,648
Earnings per share:
Basic	$ 8.80	$ 7.19	$ 6.66
Diluted	$ 8.70	$ 7.12	$ 6.59
Weighted average shares outstanding:
Basic	82,508	83,716	84,644
Diluted	83,479	84,517	85,536