Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
ASSETS
Cash and cash equivalents	$ 123,950	$ 255,530
Short-term investments	60	79,655
Accounts receivable, net of allowances of $7,988 and $4,261, respectively	199,871	114,680
Prepaid expenses and other current assets	24,118	25,722
Deferred income taxes, current	0	7,218
Total current assets	347,999	482,805
Long-term investments	0	78,563
Property and equipment, net	68,094	57,442
Trade names, net	115,853	118,965
Patent and patent licenses, net	13,928	18,841
Customer relationships, net	208,155	197,319
Goodwill	1,122,810	807,661
Other purchased intangibles, net	173,755	17,516
Deferred income taxes, non-current	5,289	0
Other assets	6,445	4,607
Total assets	2,062,328	1,783,719
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	178,071	114,384
Income taxes payable	16,753	5,589
Deferred revenue, current	80,384	76,104
Line of credit	178,817	0
Capital lease, current	64	214
Deferred income taxes, current	0	363
Total current liabilities	454,089	196,654
Long-term debt	601,746	592,037
Deferred revenue, non-current	1,588	6,538
Capital lease, non-current	0	148
Liability for uncertain tax positions	46,537	35,917
Deferred income taxes, non-current	40,357	43,989
Other long-term liabilities	3,475	18,228
Total liabilities	1,147,792	893,511
Commitments and contingencies	0	0
Common stock, $0.01 par value. Authorized 95,000,000 at December 31, 2016 and 2015; total issued and outstanding 47,443,716 and 47,950,677 shares at December 31, 2016 and 2015, respectively.	474	479
Additional paid-in capital	308,329	292,064
Retained earnings	660,382	626,789
Accumulated other comprehensive loss	(54,649)	(29,124)
Total stockholders’ equity	914,536	890,208
Total liabilities and stockholders’ equity	2,062,328	1,783,719
Series A Preferred Stock [Member]
LIABILITIES AND STOCKHOLDERS' EQUITY
Preferred stock, $0.01 par value	0	0
Total stockholders’ equity	0	0
Series B Preferred Stock [Member]
LIABILITIES AND STOCKHOLDERS' EQUITY
Preferred stock, $0.01 par value	0	0
Total stockholders’ equity	$ 0	$ 0