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Consolidated Statement of Shareholders' Deficit - USD ($)
$ 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, 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 $ 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 $ (53)   (545,636)   (545,689)
Repurchase and retirement of common stock, Shares (5,341,000)        
Foreign currency translation adjustments       131,861 131,861
BALANCE 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        
Net income     103,654   103,654
Common stock issued in connection with stock purchase/option plans $ 8 54,798     54,806
Common stock issued in connection with stock purchase/option plans, Shares 812,000        
Non-cash stock compensation   38,844     38,844
Common stock issued in connection with acquisitions $ 5 63,308     63,313
Common stock issued in connection with acquisitions, Shares 488,000        
Repurchase and retirement of common stock $ (59)   (854,475)   (854,534)
Repurchase and retirement of common stock, Shares (5,858,000)        
Foreign currency translation adjustments       (9,276) (9,276)
BALANCE at Dec. 31, 2017 $ 1,164 2,167,470 (4,388,288) (379,460) $ (2,599,114)
BALANCE, Shares at Dec. 31, 2017 116,446,000       116,446,000
Net income     47,451   $ 47,451
Common stock issued in connection with stock purchase/option plans $ 10 59,716     59,726
Common stock issued in connection with stock purchase/option plans, Shares 962,000        
Non-cash stock compensation   43,140     43,140
Repurchase and retirement of common stock $ (50)   (795,531)   (795,581)
Repurchase and retirement of common stock, Shares (4,975,000)        
Foreign currency translation adjustments       (132,445) (132,445)
BALANCE at Dec. 31, 2018 $ 1,124 $ 2,270,326 $ (5,136,368) $ (511,905) $ (3,376,823)
BALANCE, Shares at Dec. 31, 2018 112,433,000       112,433,000