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Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Common stock
Additional paid-in capital
Treasury stock
Retained earnings
Accumulated other comprehensive income / (loss)
Balance at Dec. 31, 2017 $ 1,409,016 $ 1,163 $ 1,195,339 $ (134,293) $ 438,774 $ (91,967)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation expense 5,302   5,302      
Restricted stock issuance, net of forfeitures (1,607) 4 (1,611)      
Issuance of performance shares (273) 2 (275)      
Shares issued in employee stock purchase plan 996 1 995      
Contingent shares issued for acquisition of Cooper 125   125      
Treasury stock (66)     (66)    
Currency translation adjustment 6,287         6,287
Change in pension liability 16         16
Net income (loss) 28,066       28,066  
Balance at Mar. 31, 2018 1,446,856 1,170 1,199,875 (134,359) 465,834 (85,664)
Balance at Dec. 31, 2018 1,030,126 1,174 1,214,928 (134,434) 63,688 (115,230)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation expense 3,910   3,910      
Restricted stock issuance, net of forfeitures (925) 6 (931)      
Shares issued in employee stock purchase plan 684 2 682      
Contingent shares issued for acquisition of Cooper 375 1 374      
Treasury stock (48)     (48)    
Currency translation adjustment 4,834         4,834
Change in pension liability (9)         (9)
Net income (loss) (7,888)       (7,888)  
Balance at Mar. 31, 2019 $ 1,031,059 $ 1,183 $ 1,218,963 $ (134,482) $ 55,800 $ (110,405)