Consolidated Statements Of Shareholders' Equity (Deficit) - USD ($) $ in Thousands	Common Stock [Member] Shares - Hedge [Member] Class A Common Stock [Member]	Common Stock [Member] Shares - Warrant [Member] Class A Common Stock [Member]	Common Stock [Member] Class A Common Stock [Member]	Additional Paid-In Capital [Member] Shares - Hedge [Member]	Additional Paid-In Capital [Member] Shares - Warrant [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]	Shares - Hedge [Member]	Shares - Warrant [Member]	Total
BALANCE, Amount at Dec. 31, 2013			$ 1,284			$ 2,907,446	$ (2,518,085)	$ (33,679)			$ 356,966
BALANCE, Shares at Dec. 31, 2013			128,432,000
Net income							(24,295)				(24,295)
Common stock issued in connection with stock purchase/option plans, Amount			$ 7			7,741					7,748
Common stock issued in connection with stock purchase/option plans, Shares			696,000
Non-cash stock compensation						22,999					22,999
Settlement of convertible notes, Amount			$ 117			9,450					9,567
Settlement of convertible notes, Shares			11,742,000
Settlement of convertible note hedges and common stock warrants, Amount	$ (117)			$ 124	$ (884,985)				$ 7	$ (884,985)
Settlement of convertible note hedges and common stock warrants, Shares	(11,737,000)	1,000
Foreign currency translation adjustments								(148,807)			(148,807)
BALANCE, Amount at Dec. 31, 2014			$ 1,291			2,062,775	(2,542,380)	(182,486)			(660,800)
BALANCE, Shares at Dec. 31, 2014			129,134,000
Net income							(175,656)				(175,656)
Common stock issued in connection with stock purchase/option plans, Amount			$ 6			21,604					21,610
Common stock issued in connection with stock purchase/option plans, Shares			591,000
Non-cash stock compensation						29,208					29,208
Settlement of convertible note hedges and common stock warrants, Amount					$ (150,874)					$ (150,874)
Repurchase and retirement of common stock, Amount			$ (40)				(450,033)				(450,073)
Repurchase and retirement of common stock, Shares			(3,982,000)
Foreign currency translation adjustments								(319,559)			(319,559)
BALANCE, Amount at Dec. 31, 2015			$ 1,257			1,962,713	(3,168,069)	(502,045)			(1,706,144)
BALANCE, Shares at Dec. 31, 2015			125,743,000
Net income							76,238				76,238
Common stock issued in connection with stock purchase/option plans, Amount			$ 6			14,404					14,410
Common stock issued in connection with stock purchase/option plans, Shares			602,000
Non-cash stock compensation						33,403					33,403
Repurchase and retirement of common stock, Amount			$ (53)				(545,636)				(545,689)
Repurchase and retirement of common stock, Shares			(5,341,000)
Foreign currency translation adjustments								131,861			131,861
BALANCE, Amount at Dec. 31, 2016			$ 1,210			$ 2,010,520	$ (3,637,467)	$ (370,184)			$ (1,995,921)
BALANCE, Shares at Dec. 31, 2016			121,004,000