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Consolidated Condensed Statement of Changes in Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Earnings [Member]
Accumulated Other Comprehensive (Loss) Income [Member]
Beginning Balance, Value at Dec. 31, 2012 $ 101,593 $ 728 $ 52,155 $ 49,552 $ (842)
Beginning Balance, Shares at Dec. 31, 2012   72,846,144      
Issuance of common stock upon initial public offering, net of offering costs 112,432 $ 63 112,369    
Issuance of common stock upon initial public offering, net of offering costs, Shares   6,250,000      
Share-based compensation recognized 6,179   6,179    
Tax windfall benefit on share-based compensation 1,829   1,829    
Stock options exercised, net of cashless exercise (16,822) $ 29 (16,851)    
Stock options exercised, net of cashless exercise, Shares   2,880,357      
Repurchase of common stock $ (75,000) $ (37) (74,963)    
Repurchase of common stock, Shares (3,700,000) (3,690,036)      
Net income (loss) $ (27,117)     (27,117)  
Cash dividends declared on common stock (16,390)     (16,390)  
Other comprehensive income (loss) 1,268       1,268
Ending Balance, Value at Dec. 31, 2013 87,972 $ 783 80,718 6,045 426
Ending Balance, Shares at Dec. 31, 2013   78,286,465      
Beginning Balance, Value at Dec. 31, 2013 87,972 $ 783 80,718 6,045 426
Beginning Balance, Shares at Dec. 31, 2013   78,286,465      
Beginning Balance, Value at Dec. 31, 2013 87,972 $ 783 80,718 6,045 426
Beginning Balance, Shares at Dec. 31, 2013   78,286,465      
Beginning Balance, Value at Dec. 31, 2013 87,972 $ 783 80,718 6,045 426
Beginning Balance, Shares at Dec. 31, 2013   78,286,465      
Share-based compensation recognized 4,587   4,587    
Tax windfall benefit on share-based compensation 3,669   3,669    
Stock options exercised, net of cashless exercise (1,432) $ 8 (1,440)    
Stock options exercised, net of cashless exercise, Shares   799,885      
Restricted stock grants and units delivered, net of cashless exercise (26)   (26)    
Restricted stock grants and units delivered, net of cashless exercise, Shares   7,988      
Repurchase of common stock $ (26,197) $ (12) (26,185)    
Repurchase of common stock, Shares (1,200,000) (1,201,194)      
Net income (loss) $ 66,157     66,157  
Dividend [1] 21   21    
Cash dividends declared on common stock (31,359)     (31,359)  
Cash settlement of stock options (1,604)   (1,604)    
Other comprehensive income (loss) (6,948)       (6,948)
Ending Balance, Value at Dec. 31, 2014 $ 94,840 $ 779 59,740 40,843 (6,522)
Ending Balance, Shares at Dec. 31, 2014 77,893,144 77,893,144      
Ending Balance, Value at Dec. 31, 2014 $ 94,840 $ 779 59,740 40,843 (6,522)
Ending Balance, Shares at Dec. 31, 2014 77,893,144 77,893,144      
Beginning Balance, Value at Dec. 31, 2014 $ 94,840 $ 779 59,740 40,843 (6,522)
Beginning Balance, Shares at Dec. 31, 2014 77,893,144 77,893,144      
Beginning Balance, Value at Dec. 31, 2014 $ 94,840 $ 779 59,740 40,843 (6,522)
Beginning Balance, Shares at Dec. 31, 2014 77,893,144 77,893,144      
Beginning Balance, Value at Dec. 31, 2014 $ 94,840 $ 779 59,740 40,843 (6,522)
Beginning Balance, Shares at Dec. 31, 2014 77,893,144 77,893,144      
Share-based compensation recognized $ 5,204   5,204    
Restricted stock grants and units delivered, net of cashless exercise (306) $ 1 (307)    
Restricted stock grants and units delivered, net of cashless exercise, Shares   107,892      
Repurchase of common stock $ (54,949) $ (30) (54,919)    
Repurchase of common stock, Shares (3,000,000) (3,012,826)      
Net income (loss) $ 85,377     85,377  
Cash dividends declared on common stock (30,892)     (30,892)  
Other comprehensive income (loss) (1,060)       (1,060)
Ending Balance, Value at Dec. 31, 2015 $ 98,214 $ 750 $ 9,718 $ 95,328 $ (7,582)
Ending Balance, Shares at Dec. 31, 2015 74,988,210 74,988,210      
[1] Related to dividend declared in 2012 and accrued upon vesting of stock options. Such options were forfeited during 2014.