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Condensed Consolidated Statements of Changes in Shareholders' (Deficit) Equity - 6 months ended Jun. 30, 2018 - USD ($)
$ in Thousands
Common Stock
Treasury Stock
Additional Paid-in Capital
Retained (Deficit)
Accumulated Other Comprehensive Income (Loss)
Total
Balance at Dec. 31, 2017 $ 933 $ (28,414) $ 1,007,606 $ (1,051,818) $ (1,453) $ (73,146)
Balance (in shares) at Dec. 31, 2017 91,225,242          
Increase (Decrease) in Shareholders' Deficit            
Share-based compensation arrangements $ 10   11,117     11,127
Share-based compensation arrangements (in shares) 971,043          
Cumulative-effect adjustment upon adoption of ASC 606 "Revenue from Contracts with Customers"       (9,650)   (9,650)
Net income       99,425   99,425
Balance at Jun. 30, 2018 $ 943 $ (28,414) $ 1,018,723 $ (962,043) $ (1,453) $ 27,756
Balance (in shares) at Jun. 30, 2018 92,196,285