Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
ASSETS
Cash and cash equivalents	$ 347,857	$ 242,652
Short-term investments	0	663
Accounts receivable, net of allowances of $16,255 and $16,018, respectively	249,005	325,619
Prepaid expenses and other current assets	56,177	53,909
Current assets held for sale	8,939	0
Total current assets	661,978	622,843
Long-term investments	117,396	97,495
Property and equipment, net	171,645	156,577
Operating lease right-of-use assets	82,961	105,845
Goodwill	1,837,539	1,867,430
Other purchased intangibles, net	170,530	176,473
Deferred income taxes, noncurrent	40,755	56,545
Other assets	16,759	17,027
Noncurrent assets held for sale	98,187	0
TOTAL ASSETS	3,703,366	3,665,331
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable and accrued expenses	198,220	230,651
Income taxes payable, current	11,471	31,753
Deferred revenue, current	193,531	190,644
Operating lease liabilities, current	30,818	32,211
Current portion of long-term debt	402,134	396,801
Other current liabilities	52	497
Current liabilities held for sale	8,793	0
Total current liabilities	845,019	882,557
Long-term debt	1,189,727	1,182,220
Deferred revenue, noncurrent	16,635	14,440
Operating lease liabilities, noncurrent	81,752	99,177
Income taxes payable, noncurrent	11,675	11,675
Liability for uncertain tax positions	53,515	57,081
Deferred income taxes, noncurrent	158,173	162,700
Other long-term liabilities	39,718	44,463
Noncurrent liabilities held for sale	12,652	0
TOTAL LIABILITIES	2,408,866	2,454,313
Commitments and contingencies	0	0
Preferred stock, $0.01 par value	0	0
Common stock, $0.01 par value. Authorized 95,000,000; total issued and outstanding 44,708,236 and 44,346,630 shares at June 30, 2021 and December 31, 2020, respectively.	447	443
Additional paid-in capital	461,422	456,274
Retained earnings	892,605	809,107
Accumulated other comprehensive loss	(59,974)	(54,806)
TOTAL STOCKHOLDERS’ EQUITY	1,294,500	1,211,018
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	3,703,366	3,665,331
Trade names
ASSETS
Intangible assets, net (excluding goodwill)	183,335	187,902
Customer relationship
ASSETS
Intangible assets, net (excluding goodwill)	322,281	377,194
Series A Preferred Stock
LIABILITIES AND STOCKHOLDERS’ EQUITY
Preferred stock, $0.01 par value	0	0
Series B Preferred Stock
LIABILITIES AND STOCKHOLDERS’ EQUITY
Preferred stock, $0.01 par value	$ 0	$ 0