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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Additional Paid in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (loss) [Member]
Non-controlling Interest [Member]
Beginning Balance at Dec. 31, 2014 $ 172,989 $ 190 $ 99,095 $ 69,015 $ 4,657 $ 32
Beginning Balance, Shares at Dec. 31, 2014   18,983        
Net income (loss) (6,486)     (6,486)    
Dividends declared (6,433)     (6,433)    
Share-based compensation expense 4,039 $ 1 4,038      
Share-based compensation expense, shares   115        
Shares issued for option exercises 2,041 $ 2 2,039      
Shares issued for option exercises, shares   179        
Shares issued in public offering 173,052 $ 76 172,976      
Shares issued in public offering, shares   7,590        
Restricted shares forgiven for taxes (231)   (231)      
Restricted shares forgiven for taxes and forfeited, shares   (18)        
Foreign currency translation gain (loss) (24,903)       (24,903)  
Change in fair value of interest rate swap (1,637)       (1,637)  
Ending Balance at Dec. 31, 2015 312,431 $ 269 277,917 56,096 (21,883) 32
Ending Balance, Shares at Dec. 31, 2015   26,849        
Net income (loss) 6,663     6,663    
Dividends declared (7,584)     (7,584)    
Share-based compensation expense 3,935   3,935      
Share-based compensation expense, shares   142        
Shares issued for option exercises 2,832 $ 3 2,829      
Shares issued for option exercises, shares   270        
Restricted shares forgiven for taxes (173)   (173)      
Restricted shares forgiven for taxes and forfeited, shares   (12)        
Foreign currency translation gain (loss) (10,623)       (10,623)  
Change in fair value of interest rate swap 1,910       1,910  
Ending Balance at Dec. 31, 2016 309,391 $ 272 284,508 55,175 (30,596) 32
Ending Balance, Shares at Dec. 31, 2016   27,249        
Net income (loss) 163,052     163,052    
Dividends declared (7,887)     (7,887)    
Share-based compensation expense 5,496 $ 1 5,495      
Share-based compensation expense, shares   85        
Shares issued for option exercises $ 3,110 $ 2 3,108      
Shares issued for option exercises, shares 263 263        
Sale of PBC Business (Note 2) $ (9,275)       (9,243) $ (32)
Restricted shares forgiven for taxes (617)   (617)      
Restricted shares forgiven for taxes and forfeited, shares   (25)        
Foreign currency translation gain (loss) 22,094       22,094  
Adoption of new accounting standard (Note 1) 740     740    
Ending Balance at Dec. 31, 2017 $ 486,104 $ 275 $ 292,494 $ 211,080 $ (17,745)  
Ending Balance, Shares at Dec. 31, 2017   27,572