Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
ASSETS
Cash and cash equivalents	$ 285,563	$ 255,530
Short-term investments	39,908	79,655
Accounts receivable, net of allowances of $6,643 and $4,261, respectively	114,581	114,680
Prepaid expenses and other current assets	26,567	25,722
Deferred income taxes	0	7,218
Total current assets	466,619	482,805
Long-term investments	53,421	78,563
Property and equipment, net	61,437	57,442
Trade names, net	118,891	118,965
Patent and patent licenses, net	14,441	18,841
Customer relationships, net	175,434	197,319
Goodwill	853,791	807,661
Other purchased intangibles, net	16,888	17,516
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	4,454	0
Other assets	3,769	4,607
Total assets	1,769,145	1,783,719
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	101,830	114,384
Income taxes payable	2,207	5,589
Deferred revenue, current	76,259	76,104
Capital Lease Obligations, Current	191	214
Deferred income taxes, current	0	363
Total current liabilities	180,487	196,654
Long-term Debt	599,260	592,037
Capital Lease Obligations, Noncurrent	12	148
Liability for uncertain tax positions	44,418	35,917
Deferred income taxes	39,975	43,989
Deferred revenue, non-current	2,354	6,538
Other long-term liabilities	4,445	18,228
Total liabilities	870,951	893,511
Commitments and contingencies	0	0
Common stock, $0.01 par value. Authorized 95,000,000; total issued and outstanding 47,245,704 and 47,950,677 shares, respectively	472	479
Additional paid-in capital	304,385	292,064
Retained Earnings (Accumulated Deficit)	634,386	626,789
Accumulated other comprehensive loss	(41,049)	(29,124)
Stockholders' Equity Attributable to Parent	898,194	890,208
Total liabilities and stockholders' equity	1,769,145	1,783,719
Series A Preferred Stock [Member]
LIABILITIES AND STOCKHOLDERS' EQUITY
Preferred stock, $0.01 par value	0	0
Series B Preferred Stock [Member]
LIABILITIES AND STOCKHOLDERS' EQUITY
Preferred stock, $0.01 par value	$ 0	$ 0