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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive (Loss) Income [Member]
Retained Earnings [Member]
Beginning balance (As Previously Reported [Member]) at Dec. 31, 2012 $ 53,896 $ 70 $ 913 $ 23 $ 52,890
Beginning balance (Prior Period Adjustments [Member]) (5,156) [1] 0 0 0 (5,156) [1]
Beginning balance at Dec. 31, 2012 48,740 $ 70 913 23 47,734
Beginning balance, shares (As Previously Reported [Member]) at Dec. 31, 2012   7,017,000      
Beginning balance, shares at Dec. 31, 2012   7,017,000      
Common stock issued on exercise of options and vesting of restricted stock units 1,860 $ 2 1,858 0 0
Common stock issued on exercise of options and vesting of restricted stock units, shares   148,000      
Common stock repurchased on vesting of restricted stock units (89) $ 0 (89) 0 0
Share based compensation expense 1,016 0 1,016 0 0
Excess tax benefits from share-based compensation $ 2,083 0 2,083 0 0
Company repurchase of common stock, shares 0        
Cash dividends on common stock $ (4,056) 0 0 0 (4,056)
Unrealized holding gains on marketable securities, net of tax | As Previously Reported [Member] (49)        
Unrealized holding gains on marketable securities, net of tax (49) [1] 0 0 (49) 0
Net income (loss) | As Previously Reported [Member] 17,892        
Net income (loss) | Prior Period Adjustments [Member] (2,219)        
Net income (loss) [1] 15,673 0 0 0 15,673
Ending balance at Dec. 31, 2013 [1] 65,178 $ 72 5,781 (26) 59,351
Ending balance, shares at Dec. 31, 2013 [1]   7,165,000      
Net income (loss) | As Previously Reported [Member] (3,583)        
Net income (loss) | Prior Period Adjustments [Member] 300        
Net income (loss) (3,283)        
Ending balance (As Previously Reported [Member]) at Mar. 31, 2014 68,090        
Ending balance (Prior Period Adjustments [Member]) (7,076)        
Ending balance at Mar. 31, 2014 61,014        
Beginning balance at Dec. 31, 2013 [1] 65,178 $ 72 5,781 (26) 59,351
Beginning balance, shares at Dec. 31, 2013 [1]   7,165,000      
Common stock issued on exercise of options and vesting of restricted stock units 434 $ 0 434 0 0
Common stock issued on exercise of options and vesting of restricted stock units, shares   56,000      
Common stock repurchased on vesting of restricted stock units (407) $ 0 (407) 0 0
Common stock repurchased on vesting of restricted stock units, shares   (8,000)      
Share based compensation expense 1,699 $ 0 1,699 0 0
Excess tax benefits from share-based compensation 578 0 578 0 0
Company repurchase of common stock $ (3,676) $ (1) (3,675) 0 0
Company repurchase of common stock, shares (87,200) (87,000)      
Cash dividends on common stock $ (5,443) $ 0 0 0 (5,443)
Unrealized holding gains on marketable securities, net of tax | As Previously Reported [Member] 3        
Unrealized holding gains on marketable securities, net of tax 3 [1] 0 0 3 0
Net income (loss) | As Previously Reported [Member] (27,084)        
Net income (loss) | Prior Period Adjustments [Member] 1,538        
Net income (loss) [1] (25,546) 0 0 0 (25,546)
Ending balance (As Previously Reported [Member]) at Dec. 31, 2014 38,658        
Ending balance (Prior Period Adjustments [Member]) (5,838)        
Ending balance at Dec. 31, 2014 [1] 32,820 $ 71 4,410 (23) 28,362
Ending balance, shares at Dec. 31, 2014 [1]   7,126,000      
Beginning balance (As Previously Reported [Member]) at Mar. 31, 2014 68,090        
Beginning balance (Prior Period Adjustments [Member]) (7,076)        
Beginning balance at Mar. 31, 2014 61,014        
Net income (loss) | As Previously Reported [Member] 7,283        
Net income (loss) | Prior Period Adjustments [Member] (47,065)        
Net income (loss) (39,782)        
Ending balance (As Previously Reported [Member]) at Jun. 30, 2014 73,664        
Ending balance (Prior Period Adjustments [Member]) (54,141)        
Ending balance at Jun. 30, 2014 19,523        
Net income (loss) | As Previously Reported [Member] (37,818)        
Net income (loss) | Prior Period Adjustments [Member] 46,684        
Net income (loss) 8,866        
Ending balance (As Previously Reported [Member]) at Sep. 30, 2014 34,392        
Ending balance (Prior Period Adjustments [Member]) (7,457)        
Ending balance at Sep. 30, 2014 26,935        
Net income (loss) | As Previously Reported [Member] 7,034        
Net income (loss) | Prior Period Adjustments [Member] 1,619        
Net income (loss) 8,653        
Ending balance (As Previously Reported [Member]) at Dec. 31, 2014 38,658        
Ending balance (Prior Period Adjustments [Member]) (5,838)        
Ending balance at Dec. 31, 2014 [1] 32,820 $ 71 4,410 (23) 28,362
Ending balance, shares at Dec. 31, 2014 [1]   7,126,000      
Net income (loss) | As Previously Reported [Member] (5,802)        
Net income (loss) | Prior Period Adjustments [Member] (26)        
Net income (loss) (5,828)        
Ending balance (As Previously Reported [Member]) at Mar. 31, 2015 32,085        
Ending balance (Prior Period Adjustments [Member]) (5,863)        
Ending balance at Mar. 31, 2015 26,222        
Beginning balance (As Previously Reported [Member]) at Dec. 31, 2014 38,658        
Beginning balance (Prior Period Adjustments [Member]) (5,838)        
Beginning balance at Dec. 31, 2014 [1] 32,820 $ 71 4,410 (23) 28,362
Beginning balance, shares at Dec. 31, 2014 [1]   7,126,000      
Common stock issued on exercise of options and vesting of restricted stock units 702 $ 1 701 0 0
Common stock issued on exercise of options and vesting of restricted stock units, shares   89,000      
Common stock repurchased on vesting of restricted stock units (465) $ 0 (465) 0 0
Common stock repurchased on vesting of restricted stock units, shares   (12,000)      
Share based compensation expense 2,386 $ 0 2,386 0 0
Excess tax benefits from share-based compensation $ (68) 0 (68) 0 0
Company repurchase of common stock, shares 0        
Cash dividends on common stock $ (6,310) 0 0 0 (6,310)
Unrealized holding gains on marketable securities, net of tax (8) 0 0 (8) 0
Net income (loss) 25,494 0 0 0 25,494
Ending balance at Dec. 31, 2015 54,551 $ 72 6,964 (31) 47,546
Ending balance, shares at Dec. 31, 2015   7,203,000      
Beginning balance (As Previously Reported [Member]) at Mar. 31, 2015 32,085        
Beginning balance (Prior Period Adjustments [Member]) (5,863)        
Beginning balance at Mar. 31, 2015 26,222        
Net income (loss) | As Previously Reported [Member] 8,746        
Net income (loss) | Prior Period Adjustments [Member] 156        
Net income (loss) 8,902        
Ending balance (As Previously Reported [Member]) at Jun. 30, 2015 40,251        
Ending balance (Prior Period Adjustments [Member]) (5,707)        
Ending balance at Jun. 30, 2015 34,544        
Net income (loss) 10,973        
Ending balance at Sep. 30, 2015 44,181        
Net income (loss) 11,447        
Ending balance at Dec. 31, 2015 $ 54,551 $ 72 $ 6,964 $ (31) $ 47,546
Ending balance, shares at Dec. 31, 2015   7,203,000      
[1] See Note 2. Restatement of Previously Issued Consolidated Financial Statements