Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 95,222	$ 434,159
Accounts receivable, net of allowance for doubtful accounts of $3,957 and $2,957, respectively	239,428	169,951
Prepaid expenses and other current assets	32,598	27,511
Prepaid income taxes	39,319	40,627
Restricted cash	2,818	2,818
Total current assets	409,385	675,066
Property, plant and equipment:
Land	2,655	2,655
Building and improvements	37,042	37,855
Equipment, furniture, and fixtures	112,436	97,274
Total property and equipment	152,133	137,784
Less: accumulated depreciation	(82,576)	(70,641)
Net property, plant and equipment	69,557	67,143
Deferred income taxes	2,018	2,199
Goodwill (Note 3)	3,636,495	3,549,212
Intangible and other assets, net of accumulated amortization of $634,518 and $536,929, respectively	1,571,384	1,508,622
Total assets	5,688,839	5,802,242
Current liabilities:
Current portion of long-term debt (Note 2)	30,878	32,281
Accounts payable	20,033	11,957
Income taxes payable		1,428
Accrued employee compensation and benefits	55,836	83,894
Interest payable	22,386	28,903
Other accrued expenses	45,964	36,231
Deferred revenue	238,785	222,024
Total current liabilities	413,882	416,718
Long-term debt, net of current portion (Note 2)	2,569,971	2,719,070
Other long-term liabilities	61,915	51,434
Deferred income taxes	478,641	509,574
Total liabilities	3,524,409	3,696,796
Commitments and contingencies (Note 8)
Common stock:
Common stock	2,018	1,932
Additional paid-in capital	1,859,124	1,793,149
Accumulated other comprehensive loss	(100,642)	(83,170)
Retained earnings	421,926	411,493
Stockholders' equity before treasury stock	2,182,426	2,123,431
Less: cost of common stock in treasury, 1,573,200 and 1,572,878 shares, respectively	(17,996)	(17,985)
Total stockholders’ equity	2,164,430	2,105,446
Total liabilities and stockholders’ equity	$ 5,688,839	5,802,242
Class A Non-Voting Common Stock [Member]
Common stock:
Common stock		$ 27