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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDER'S EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Treasury Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Loss
Retained Earnings
Balance Beginning of Period, Shares (in shares) at Dec. 31, 2017   81,306,000        
Balance, Beginning of Period at Dec. 31, 2017 $ 962,306 $ 813 $ (121,644) $ 821,758 $ (23,807) $ 285,186
Balance, Beginning of Period, Treasury Stock, Shares (in shares) at Dec. 31, 2017     (2,927,000)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) 35,663         35,663
Other comprehensive loss, net of tax (1,931)       (2,464) 533
Issuance of common stock (in shares)   597,000        
Issuance of common stock 8,677 $ 6   8,671    
Issuance of common stock through employee stock purchase plan 553     553    
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes (in shares)   75,000 44,000      
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes (7,414) $ 1 $ 917 (8,332)    
Equity offering (in shares)   6,038,000        
Equity offering 349,598 $ 60   349,538    
Share-based compensation 15,775     15,775    
Balance End of Period, Shares (in shares) at Sep. 30, 2018   88,016,000        
Balance, End of Period at Sep. 30, 2018 1,365,081 $ 880 $ (120,727) 1,187,963 (26,271) 323,236
Balance, End of Period, Treasury Stock, Shares (in shares) at Sep. 30, 2018     (2,883,000)      
Balance Beginning of Period, Shares (in shares) at Jun. 30, 2018   87,772,000        
Balance, Beginning of Period at Jun. 30, 2018 1,341,905 $ 877 $ (120,732) 1,177,125 (25,306) 309,941
Balance, Beginning of Period, Treasury Stock, Shares (in shares) at Jun. 30, 2018     (2,890,000)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) 13,295         13,295
Other comprehensive loss, net of tax (965)       (965) 0
Issuance of common stock (in shares)   261,000        
Issuance of common stock 5,502 $ 3   5,499    
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes (in shares)   17,000 7,000      
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes (215)   $ 5 (220)    
Share-based compensation 5,559     5,559    
Balance End of Period, Shares (in shares) at Sep. 30, 2018   88,016,000        
Balance, End of Period at Sep. 30, 2018 1,365,081 $ 880 $ (120,727) 1,187,963 (26,271) 323,236
Balance, End of Period, Treasury Stock, Shares (in shares) at Sep. 30, 2018     (2,883,000)      
Balance Beginning of Period, Shares (in shares) at Dec. 31, 2018   88,044,000        
Balance, Beginning of Period at Dec. 31, 2018 $ 1,375,796 $ 880 $ (120,615) 1,192,601 (45,443) 348,373
Balance, Beginning of Period, Treasury Stock, Shares (in shares) at Dec. 31, 2018 (2,881,000)   (2,881,000)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) $ 34,882         34,882
Other comprehensive loss, net of tax (42,172)       (42,172)  
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes (in shares)   645,000 12,000      
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes 677 $ 6 $ 514 157    
Share-based compensation 15,791     15,791    
Balance End of Period, Shares (in shares) at Sep. 30, 2019   88,689,000        
Balance, End of Period at Sep. 30, 2019 $ 1,384,974 $ 886 $ (120,101) 1,208,549 (87,615) 383,255
Balance, End of Period, Treasury Stock, Shares (in shares) at Sep. 30, 2019 (2,869,000)   (2,869,000)      
Balance Beginning of Period, Shares (in shares) at Jun. 30, 2019   88,351,000        
Balance, Beginning of Period at Jun. 30, 2019 $ 1,420,951 $ 883 $ (120,107) 1,198,010 (68,700) 410,865
Balance, Beginning of Period, Treasury Stock, Shares (in shares) at Jun. 30, 2019     (2,869,000)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) (27,610)         (27,610)
Other comprehensive loss, net of tax (18,915)       (18,915)  
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes (in shares)   338,000        
Issuance of common stock for vesting of share based awards, net of shares withheld for taxes 4,674 $ 3 $ 6 4,665    
Share-based compensation 5,874     5,874    
Balance End of Period, Shares (in shares) at Sep. 30, 2019   88,689,000        
Balance, End of Period at Sep. 30, 2019 $ 1,384,974 $ 886 $ (120,101) $ 1,208,549 $ (87,615) $ 383,255
Balance, End of Period, Treasury Stock, Shares (in shares) at Sep. 30, 2019 (2,869,000)   (2,869,000)