Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
ASSETS
Cash and cash equivalents	$ 92,185	$ 209,474
Accounts receivable, net of allowances of $12,335 and $10,422, respectively	203,869	221,615
Prepaid expenses and other current assets	48,857	29,242
Total current assets	344,911	460,331
Long-term investments	96,788	83,828
Property and equipment, net	117,496	98,813
Operating Lease, Right-of-Use Asset	90,134	0
Trade names, net	141,933	142,888
Customer relationships, net	257,260	191,208
Goodwill	1,626,266	1,380,376
Other purchased intangibles, net	205,713	192,372
Other assets	12,799	11,014
Total assets	2,893,300	2,560,830
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable and accrued expenses	226,366	166,521
Income taxes payable, current	2,144	12,915
Deferred revenue, current	155,162	127,568
Operating Lease, Liability, Current	24,078	0
Other current liabilities	2,303	318
Total current liabilities	410,053	307,322
Long-term debt	1,150,515	1,013,129
Deferred revenue, noncurrent	11,807	13,200
Operating Lease, Liability, Noncurrent	70,927	0
Accrued Income Taxes, Noncurrent	11,675	11,675
Liability for uncertain tax positions	50,758	59,644
Deferred income taxes, non-current	83,496	69,048
Other long-term liabilities	19,701	51,068
Total liabilities	1,808,932	1,525,086
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 47,585,935 and 48,082,800 shares at September 30, 2019 and December 31, 2018, respectively; total outstanding 47,585,935 and 47,482,800 shares at September 30, 2019 and December 31, 2018, respectively.	476	481
Additional paid-in capital	369,973	354,210
Treasury stock, at cost (zero and 600,000 shares, at September 30, 2019 and December 31, 2018, respectively).	0	(42,543)
Retained earnings	768,192	769,575
Accumulated other comprehensive loss	(54,273)	(45,979)
Stockholders' Equity Attributable to Parent	1,084,368	1,035,744
Total liabilities and stockholders’ equity	2,893,300	2,560,830
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