Consolidated Statement of Shareholders' Deficit - 9 months ended Sep. 30, 2018 - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member] Class A Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]	Total
BALANCE at Dec. 31, 2017	$ 1,164	$ 2,167,470	$ (4,388,288)	$ (379,460)	$ (2,599,114)
BALANCE, Shares at Dec. 31, 2017	116,446
Net loss			(9,702)		(9,702)
Common stock issued in connection with stock purchase/option plans	$ 6	33,523			33,529
Common stock issued in connection with stock purchase/option plans, Shares	611
Non-cash stock compensation		32,800			32,800
Repurchase and retirement of common stock	$ (28)		(453,511)		(453,539)
Repurchase and retirement of common stock, Shares	(2,813)
Foreign currency translation adjustments				(149,057)	(149,057)
BALANCE at Sep. 30, 2018	$ 1,142	$ 2,233,793	$ (4,851,501)	$ (528,517)	$ (3,145,083)
BALANCE, Shares at Sep. 30, 2018	114,244