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Consolidated statements of changes in stockholders' equity - USD ($)
$ in Thousands
Total
Common Stock
Additional paid in capital
Treasury Shares
Warrants
Retained earnings
Accumulated other comprehensive income / (loss)
Total common Stockholders’ equity
Non controlling Interest
Balance at Dec. 31, 2013 $ 1,330,966 $ 964 $ 826,028 $ (30,249) $ 687 $ 525,140 $ 7,785 $ 1,330,355 $ 611
Balance (in shares) at Dec. 31, 2013   96,306,753   (3,585,098)          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Restricted stock issuance, net of forfeitures (in shares)   70,179              
Restricted stock issuance, net of forfeitures (679) $ 1 (680)         (679)  
Stock based compensation expense 18,770   18,770         18,770  
Exercised stock options (in shares)   1,108,045              
Exercised stock options 9,185 $ 11 9,174         9,185  
Exercise of warrants (in shares)   248,189              
Exercise of warrants   $ 2 685   (687)        
Issuance of performance shares (in shares)   21,603              
Issuance of performance shares (70)   (70)         (70)  
Shares issued in employee stock purchase plan (in shares)   110,509              
Shares issued in employee stock purchase plan 2,665 $ 1 2,664         2,665  
Treasury stock (in shares)       (4,523,885)          
Treasury stock (102,231)     $ (102,231)       (102,231)  
Excess tax benefits 7,742   7,742         7,742  
Change in pension liability (1,110)           (1,110) (1,110)  
Currency translation adjustment (43,694)           (43,636) (43,636) (58)
Net income (loss) 174,377         174,365   174,365 12
Balance at Dec. 31, 2014 1,395,921 $ 979 864,313 $ (132,480) 0 699,505 (36,961) 1,395,356 565
Balance (in shares) at Dec. 31, 2014   97,865,278.000   (8,108,983)          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Restricted stock issuance, net of forfeitures (in shares)   157,577              
Restricted stock issuance, net of forfeitures (874) $ 1 (875)         (874)  
Stock based compensation expense 21,675   21,675         21,675  
Exercised stock options (in shares)   419,363              
Exercised stock options 3,622 $ 4 3,618         3,622  
Issuance of performance shares (in shares)   17,282              
Issuance of performance shares (22)   (22)         (22)  
Shares issued in employee stock purchase plan (in shares)   146,402              
Shares issued in employee stock purchase plan 2,549 $ 2 2,547         2,549  
Treasury stock (in shares)       (36,819)          
Treasury stock (838)     $ (838)       (838)  
Excess tax benefits (8)   (8)         (8)  
Change in pension liability 46           46 46  
Currency translation adjustment (45,270)           (45,133) (45,133) (137)
Net income (loss) (119,384)         (119,353)   (119,353) (31)
Balance at Dec. 31, 2015 1,257,417 $ 986 891,248 $ (133,318) 0 580,152 (82,048) 1,257,020 397
Balance (in shares) at Dec. 31, 2015   98,605,902.000   (8,145,802)          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Restricted stock issuance, net of forfeitures (in shares)   670,769              
Restricted stock issuance, net of forfeitures (1,045) $ 6 (1,051)         (1,045)  
Stock based compensation expense $ 20,535   20,535         20,535  
Exercised stock options (in shares) 151,000 151,335              
Exercised stock options $ 1,712 $ 2 1,710         1,712  
Issuance of performance shares (in shares)   42,443              
Issuance of performance shares (47) $ 1 (48)         (47)  
Shares issued in employee stock purchase plan (in shares)   186,679              
Shares issued in employee stock purchase plan 1,978 $ 2 1,976         1,978  
Equity offering (in shares)   4,025,000              
Equity offering 85,078 $ 40 85,038         85,078  
Treasury stock (in shares)       (29,161)          
Treasury stock (623)     $ (623)       (623)  
Excess tax benefits (1,239)   (1,239)         (1,239)  
Change in pension liability (335)           (335) (335)  
Currency translation adjustment (45,722)           (45,854) (45,854) 132
Net income (loss) (81,948)         (81,978)   (81,978) 30
Balance at Dec. 31, 2016 $ 1,235,761 $ 1,037 $ 998,169 $ (133,941) $ 0 $ 498,174 $ (128,237) $ 1,235,202 $ 559
Balance (in shares) at Dec. 31, 2016   103,682,128.000   (8,174,963)