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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Preferred stock [Member]
Common stock [Member]
Additional paid-in capital [Member]
Treasury stock, at cost [Member]
Accumulated other comprehensive loss [Member]
Accumulated deficit [Member]
Balance, start at Dec. 31, 2014 $ 1,096,068 $ 1 $ 939 $ 2,510,261 $ (49,924) $ (117,682) $ (1,247,527)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]              
Net income (loss) (59,310)           (59,310)
Other comprehensive income 5,032         5,032  
Repurchase of common stock (36,352)       (36,352)    
Share-based compensation expense 3,373   1 3,372      
Conversion of preferred stock to common stock     2 (2)      
Balance, end at Dec. 31, 2015 1,008,811 1 942 2,513,631 (86,276) (112,650) (1,306,837)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]              
Net income (loss) (252,415)           (252,415)
Other comprehensive income (1,243)         (1,243)  
Share-based compensation expense 1,502     1,502      
Conversion of preferred stock to common stock     2 (2)      
Balance, end at Dec. 31, 2016 756,655 1 944 2,515,131 (86,276) (113,893) (1,559,252)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]              
Net income (loss) 48,580           48,580
Other comprehensive income 22,151         22,151  
Share-based compensation expense 2,257   2 2,255      
Conversion of preferred stock to common stock     1 (1)      
Balance, end at Dec. 31, 2017 $ 829,643 $ 1 $ 947 $ 2,517,385 $ (86,276) $ (91,742) $ (1,510,672)