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Consolidated statements of changes in stockholders' equity - USD ($)
$ in Thousands
Total
Common stock
Additional paid in capital
Treasury shares
Retained earnings
Accumulated other comprehensive income / (loss)
Total common stockholders’ equity
Non controlling Interest
Balance (in shares) at Dec. 31, 2015   98,605,902            
Balance at Dec. 31, 2015 $ 1,257,417 $ 986 $ 891,248 $ (133,318) $ 580,152 $ (82,048) $ 1,257,020 $ 397
Shares held in treasury (in shares) at Dec. 31, 2015       (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)   151,335            
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 and shares issued for acquisition (in shares)   4,025,000            
Equity offering and shares issued for acquisition 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 loss (81,948)       (81,978)   (81,978) 30
Balance (in shares) at Dec. 31, 2016   103,682,128            
Balance at Dec. 31, 2016 1,235,761 $ 1,037 998,169 $ (133,941) 498,174 (128,237) 1,235,202 559
Shares held in treasury (in shares) at Dec. 31, 2016       (8,174,963)        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Restricted stock issuance, net of forfeitures (in shares)   429,321            
Restricted stock issuance, net of forfeitures (3,149) $ 3 (3,152)       (3,149)  
Stock-based compensation expense 20,310   20,310       20,310  
Exercised stock options (in shares)   161,233            
Exercised stock options 1,491 $ 2 1,489       1,491  
Issuance of performance shares (in shares)   250,643            
Issuance of performance shares (1,241) $ 3 (1,244)       (1,241)  
Shares issued in employee stock purchase plan (in shares)   135,882            
Shares issued in employee stock purchase plan 1,913 $ 1 1,912       1,913  
Equity offering and shares issued for acquisition (in shares)   11,684,449            
Equity offering and shares issued for acquisition 177,972 $ 117 177,855       177,972  
Sale of non-controlling interest (559)             (559)
Treasury stock (in shares)       (15,399)        
Treasury stock (352)     $ (352)     (352)  
Change in pension liability 107         107 107  
Currency translation adjustment 36,163         36,163 36,163  
Net loss (59,400)       (59,400)   (59,400)  
Balance (in shares) at Dec. 31, 2017   116,343,656            
Balance at Dec. 31, 2017 1,409,016 $ 1,163 1,195,339 $ (134,293) 438,774 (91,967) 1,409,016 0
Shares held in treasury (in shares) at Dec. 31, 2017       (8,190,362)        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Restricted stock issuance, net of forfeitures (in shares)   702,145            
Restricted stock issuance, net of forfeitures (2,363) $ 7 (2,370)       (2,363)  
Stock-based compensation expense $ 19,927   19,927       19,927  
Exercised stock options (in shares) 35,000 35,261            
Exercised stock options $ 249   249       249  
Issuance of performance shares (in shares)   156,953            
Issuance of performance shares (273) $ 2 (275)       (273)  
Shares issued in employee stock purchase plan (in shares)   164,743            
Shares issued in employee stock purchase plan 1,935 $ 2 1,933       1,935  
Contingent shares issued for acquisition of Cooper (in shares)   8,400            
Contingent shares issued for acquisition of Cooper 125   125       125  
Treasury stock (in shares)       (10,115)        
Treasury stock (141)     $ (141)     (141)  
Change in pension liability 1,489         1,489 1,489  
Currency translation adjustment (24,752)         (24,752) (24,752)  
Net loss (374,080)       (374,080)   (374,080)  
Balance (in shares) at Dec. 31, 2018   117,411,158            
Balance at Dec. 31, 2018 $ 1,030,126 $ 1,174 $ 1,214,928 $ (134,434) $ 63,688 $ (115,230) $ 1,030,126 $ 0
Shares held in treasury (in shares) at Dec. 31, 2018       (8,200,477)