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Consolidated Statements of Changes in Shareholders' Equity (USD $)
In Thousands, except Share data
Total
Common Shares [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income [Member]
Balance, Amount at Dec. 31, 2010 $ 293,918 $ 1,772 $ 195,597 $ 90,119 $ 6,430
Balance, Shares at Dec. 31, 2010   17,726,645      
Net income (18,110)     (18,110)  
Unrealized gain (loss) on derivative instrument net of tax benefit (437)       (437)
Translation adjustment (2,279)       (2,279)
Purchase of minority interest (517)   (517)    
Tax benefit on exercise of stock options 1,737   1,737    
Reclassification for tax benefit on exercise of stock options (8,999)   (8,999)    
Share-based compensation expense 6,648   6,648    
Common shares issued 20,113 74 20,039    
Common shares issued, Shares   738,799      
Balance, Amount at Dec. 31, 2011 292,074 1,846 214,505 72,009 3,714
Balance, Shares at Dec. 31, 2011   18,465,444      
Net income 42,838     42,838  
Unrealized gain (loss) on derivative instrument net of tax benefit 263       263
Translation adjustment 768       768
Share-based compensation expense 6,303   6,303    
Common shares issued 25,586 88 25,498    
Common shares issued, Shares   873,885      
Balance, Amount at Dec. 31, 2012 367,832 1,934 246,306   4,745
Balance, Shares at Dec. 31, 2012 19,339,329 19,339,329      
Net income (25,515)     (25,515)  
Unrealized gain (loss) on derivative instrument net of tax benefit (278)       (278)
Translation adjustment (1,768)       (1,768)
Share-based compensation expense 6,267   6,267    
Common shares issued 3,450 20 3,430    
Common shares issued, Shares   200,584      
Retirement of repurchased common stock (39,494) (144) (39,350)    
Retirement of repurchased common stock, Shares   (1,437,578)      
Balance, Amount at Dec. 31, 2013 $ 310,494 $ 1,810 $ 216,653 $ 89,332 $ 2,699
Balance, Shares at Dec. 31, 2013 18,102,335 18,102,335