CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net loss	$ (2,056)	$ (66,453)	$ (104,026)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	161,011	174,263	178,815
Stock-based compensation expense	34,663	39,254	37,010
Excess tax benefits from stock-based compensation	(644)	0	(3,887)
Deferred taxes	(2,206)	(56)	(43,880)
Asset impairment charges	1,544	2,390	11,454
Other losses, net	2,919	3,951	1,398
Changes in operating assets and liabilities (net of businesses acquired):
Accounts receivable, net	3,215	(14,644)	(7,705)
Prepaid expenses and other assets	17,614	(7,038)	(23,481)
Accounts payable	(11,953)	(1,944)	23,794
Accrued expenses	(22,974)	(22,767)	(4,552)
Accrued compensation and benefits	10,257	(29,544)	33,482
Deferred revenue	20,372	33,109	(1,573)
Other liabilities	(183)	(7,025)	(15,862)
Net cash provided by operating activities	211,579	103,496	80,987
Cash flows from investing activities:
Capital expenditures	(18,322)	(26,438)	(74,130)
Capitalized software	(49,264)	(40,661)	(42,026)
Purchase of controlling interest, net of cash acquired	(9,372)	(20,180)	(148,875)
Purchases of non-marketable securities, other investments and related intangible assets	(215,786)	(21,544)	0
Sales and maturities of marketable securities and other investments	3,763	50	12,891
Proceeds received from sale of fixed assets	15	85	0
Net cash used in investing activities	(288,966)	(108,688)	(252,140)
Cash flows from financing activities:
Proceeds from issuance 1.25% senior cash convertible notes, net of issuance costs	0	0	336,662
Purchase of call option related to 1.25% senior cash convertible notes	0	0	(82,800)
Proceeds from issuance of warrants, net of issuance costs	0	0	51,208
Proceeds from sale or issuance of common stock	103,631	1,487	11,447
Excess tax benefits from stock-based compensation	644	0	3,887
Taxes paid related to net share settlement of equity awards	(7,062)	(10,400)	(9,732)
Payments of capital lease obligations	(598)	(455)	(458)
Payments of acquisition financing obligations	0	0	(29,671)
Credit facility payments	(238,511)	(96,876)	(609,593)
Credit facility borrowings	284,161	101,964	460,983
Net cash provided by (used in) financing activities	142,265	(4,280)	131,933
Effect of exchange rate changes on cash and cash equivalents	(1,178)	(309)	(1,782)
Net increase (decrease) in cash and cash equivalents	63,700	(9,781)	(41,002)
Cash and cash equivalents, beginning of period	53,173	62,954	103,956
Cash and cash equivalents, end of period	$ 116,873	$ 53,173	$ 62,954