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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Treasury Stock
Additional Paid-In Capital
Accumulated Earnings
Accumulated Other Comprehensive Income (Loss)
Common Stock, Beginning of period (in shares) at Dec. 31, 2017   47,577        
Beginning balance at Dec. 31, 2017 $ 554,341 $ 48 $ (185,074) $ 585,755 $ 159,725 $ (6,113)
Treasury Stock, Beginning of period (in shares) at Dec. 31, 2017     (9,145)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 2,720       2,720  
Other comprehensive income 2,674         2,674
Share-based compensation 6,528     6,528    
Issuance of common stock under employee stock plans (in shares)   428        
Issuance of common stock under employee stock plans 9,541 $ 0   9,541    
Tax payments related to restricted stock units (1,300)     (1,300)    
Common Stock, End of period (in shares) at Mar. 31, 2018   48,005        
Ending balance at Mar. 31, 2018 574,504 $ 48 $ (185,074) 600,524 162,445 (3,439)
Treasury Stock, End of period (in shares) at Mar. 31, 2018     (9,145)      
Common Stock, Beginning of period (in shares) at Dec. 31, 2017   47,577        
Beginning balance at Dec. 31, 2017 554,341 $ 48 $ (185,074) 585,755 159,725 (6,113)
Treasury Stock, Beginning of period (in shares) at Dec. 31, 2017     (9,145)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 9,308          
Other comprehensive income (1,830)          
Common Stock, End of period (in shares) at Jun. 30, 2018   48,346        
Ending balance at Jun. 30, 2018 588,640 $ 48 $ (185,074) 612,576 169,033 (7,943)
Treasury Stock, End of period (in shares) at Jun. 30, 2018     (9,145)      
Common Stock, Beginning of period (in shares) at Mar. 31, 2018   48,005        
Beginning balance at Mar. 31, 2018 574,504 $ 48 $ (185,074) 600,524 162,445 (3,439)
Treasury Stock, Beginning of period (in shares) at Mar. 31, 2018     (9,145)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 6,588       6,588  
Other comprehensive income (4,504)         (4,504)
Share-based compensation 7,238     7,238    
Issuance of common stock under employee stock plans (in shares)   341        
Issuance of common stock under employee stock plans 6,576 $ 0   6,576    
Tax payments related to restricted stock units (1,762)     (1,762)    
Common Stock, End of period (in shares) at Jun. 30, 2018   48,346        
Ending balance at Jun. 30, 2018 588,640 $ 48 $ (185,074) 612,576 169,033 (7,943)
Treasury Stock, End of period (in shares) at Jun. 30, 2018     (9,145)      
Common Stock, Beginning of period (in shares) at Dec. 31, 2018   49,480        
Beginning balance at Dec. 31, 2018 $ 679,617 $ 50 $ (185,074) 678,041 197,454 (10,854)
Treasury Stock, Beginning of period (in shares) at Dec. 31, 2018 (9,145)   (9,145)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income $ 3,284       3,284  
Other comprehensive income 352         352
At the market equity offering, net of costs ( in shares )   243        
At the market equity offering, net of costs 20,216     20,216    
Share-based compensation 8,410     8,410    
Issuance of common stock under employee stock plans (in shares)   628        
Issuance of common stock under employee stock plans 20,526 $ 0   20,526    
Tax payments related to restricted stock units (1,920)     (1,920)    
Common Stock, End of period (in shares) at Mar. 31, 2019   50,351        
Ending balance at Mar. 31, 2019 730,485 $ 50 $ (185,074) 725,273 200,738 (10,502)
Treasury Stock, End of period (in shares) at Mar. 31, 2019     (9,145)      
Common Stock, Beginning of period (in shares) at Dec. 31, 2018   49,480        
Beginning balance at Dec. 31, 2018 $ 679,617 $ 50 $ (185,074) 678,041 197,454 (10,854)
Treasury Stock, Beginning of period (in shares) at Dec. 31, 2018 (9,145)   (9,145)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income $ 19,260          
Other comprehensive income (722)          
Common Stock, End of period (in shares) at Jun. 30, 2019   50,784        
Ending balance at Jun. 30, 2019 $ 773,242 $ 51 $ (185,074) 753,127 216,714 (11,576)
Treasury Stock, End of period (in shares) at Jun. 30, 2019 (9,145)   (9,145)      
Common Stock, Beginning of period (in shares) at Mar. 31, 2019   50,351        
Beginning balance at Mar. 31, 2019 $ 730,485 $ 50 $ (185,074) 725,273 200,738 (10,502)
Treasury Stock, Beginning of period (in shares) at Mar. 31, 2019     (9,145)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 15,976       15,976  
Other comprehensive income (1,074)         (1,074)
At the market equity offering, net of costs ( in shares )   217        
At the market equity offering, net of costs 17,590     17,590    
Share-based compensation 8,260     8,260    
Issuance of common stock under employee stock plans (in shares)   216        
Issuance of common stock under employee stock plans 4,807 $ 1   4,806    
Tax payments related to restricted stock units (2,802)     (2,802)    
Common Stock, End of period (in shares) at Jun. 30, 2019   50,784        
Ending balance at Jun. 30, 2019 $ 773,242 $ 51 $ (185,074) $ 753,127 $ 216,714 $ (11,576)
Treasury Stock, End of period (in shares) at Jun. 30, 2019 (9,145)   (9,145)