Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 434,159	$ 109,577
Accounts receivable, net of allowance for doubtful accounts of $2,957 and $2,241, respectively (Note 3)	169,951	94,359
Prepaid expenses and other current assets	27,511	14,927
Prepaid income taxes	40,627	11,857
Deferred income taxes		2,975
Restricted cash	2,818	1,477
Total current assets	675,066	235,172
Property, plant and equipment:
Land	2,655	2,655
Building and improvements	37,855	28,521
Equipment, furniture, and fixtures	97,274	79,564
Total property and equipment	137,784	110,740
Less: accumulated depreciation	(70,641)	(56,463)
Net property, plant and equipment	67,143	54,277
Deferred income taxes	2,199	1,135
Goodwill	3,549,212	1,573,227
Intangible and other assets, net of accumulated amortization of $536,929 and $416,708, respectively (Note 2)	1,508,622	402,344
Total assets	5,802,242	2,266,155
Current liabilities:
Current portion of long-term debt (Note 6)	32,281	20,470
Accounts payable	11,957	12,004
Income taxes payable	1,428	1,116
Accrued employee compensation and benefits	83,894	53,975
Deferred income taxes		110
Interest payable	28,903
Other accrued expenses	36,231	30,666
Deferred revenue	222,024	73,254
Total current liabilities	416,718	191,595
Long-term debt, net of current portion (Note 6)	2,719,070	599,268
Other long-term liabilities	51,434	26,446
Deferred income taxes	509,574	102,176
Total liabilities	$ 3,696,796	$ 919,485
Commitments and contingencies (Note 12)
Common stock:
Common stock	$ 966	$ 822
Additional paid-in capital	1,794,115	964,845
Accumulated other comprehensive income	(83,170)	(15,121)
Retained earnings	411,493	414,082
Stockholders' equity before treasury stock	2,123,431	1,364,655
Less: cost of common stock in treasury, 786,439 shares	(17,985)	(17,985)
Total stockholders’ equity	2,105,446	1,346,670
Total liabilities and stockholders’ equity	5,802,242	2,266,155
Class A Non-Voting Common Stock [Member]
Common stock:
Common stock	27	27
Total stockholders’ equity	$ 27	$ 27