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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Total
Balances (in shares) at Dec. 31, 2017 9,619,755        
Beginning balance at Dec. 31, 2017 $ 96 $ 119,856 $ 81,757 $ (1,445) $ 200,264
Net income     20,164   20,164
Other comprehensive income (loss):          
Pension liability adjustment, net of tax expense/benefit       84 84
Unrealized loss on cash flow hedges, net of tax benefit       19 19
Issuance of common stock under stock compensation plans (in shares) 115,300        
Issuance of common stock under stock compensation plans $ 1 (1,302)     (1,301)
Share-based compensation expense   281     281
Balances (in shares) at Dec. 31, 2017 9,619,755        
Beginning balance at Dec. 31, 2017 $ 96 119,856 81,757 (1,445) 200,264
Other comprehensive income (loss):          
Net income     20,164   20,164
Cumulative-effect adjustment for ASU 2018-02 (Note 14) at Dec. 31, 2017 (875) (875)
Balances (in shares) at Sep. 30, 2018 9,735,055        
Ending balance at Sep. 30, 2018 $ 97 118,835 101,046 (1,342) 218,636
Balances (in shares) at Jun. 30, 2018 9,735,055        
Beginning balance at Jun. 30, 2018 $ 97 118,835 73,245 (1,349) 190,828
Net income     27,801   27,801
Other comprehensive income (loss):          
Pension liability adjustment, net of tax expense/benefit       23 23
Unrealized loss on cash flow hedges, net of tax benefit       (16) (16)
Balances (in shares) at Jun. 30, 2018 9,735,055        
Beginning balance at Jun. 30, 2018 $ 97 118,835 73,245 (1,349) 190,828
Other comprehensive income (loss):          
Net income     27,801   27,801
Balances (in shares) at Sep. 30, 2018 9,735,055        
Ending balance at Sep. 30, 2018 $ 97 118,835 101,046 (1,342) 218,636
Balances (in shares) at Dec. 31, 2018 9,735,055        
Beginning balance at Dec. 31, 2018 $ 97 118,835 101,194 (1,536) 218,590
Net income     15,886   15,886
Other comprehensive income (loss):          
Pension liability adjustment, net of tax expense/benefit       78 78
Unrealized loss on cash flow hedges, net of tax benefit       (17) (17)
Issuance of common stock under stock compensation plans (in shares) 11,924        
Issuance of common stock under stock compensation plans        
Share-based compensation expense   1,216     1,216
Balances (in shares) at Dec. 31, 2018 9,735,055        
Beginning balance at Dec. 31, 2018 $ 97 118,835 101,194 (1,536) 218,590
Other comprehensive income (loss):          
Net income     15,886   15,886
Cumulative-effect adjustment for ASU 2018-02 (Note 14) at Dec. 31, 2018     235 (235)
Balances (in shares) at Sep. 30, 2019 9,746,979        
Ending balance at Sep. 30, 2019 $ 97 120,051 117,315 (1,710) 235,753
Balances (in shares) at Jun. 30, 2019 9,744,827        
Beginning balance at Jun. 30, 2019 $ 97 119,510 106,568 (1,733) 224,442
Net income     10,747   10,747
Other comprehensive income (loss):          
Pension liability adjustment, net of tax expense/benefit       25 25
Unrealized loss on cash flow hedges, net of tax benefit       (2) (2)
Issuance of common stock under stock compensation plans (in shares) 2,152        
Issuance of common stock under stock compensation plans        
Share-based compensation expense   541     541
Balances (in shares) at Jun. 30, 2019 9,744,827        
Beginning balance at Jun. 30, 2019 $ 97 119,510 106,568 (1,733) 224,442
Other comprehensive income (loss):          
Net income     10,747   10,747
Balances (in shares) at Sep. 30, 2019 9,746,979        
Ending balance at Sep. 30, 2019 $ 97 $ 120,051 $ 117,315 $ (1,710) $ 235,753