Consolidated Statements of Stockholders' Equity (USD $)
In Thousands, unless otherwise specified
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Total
Balance at Dec. 31, 2010 $ 188 $ 116,950 $ 48,072 $ (7,683) $ 157,527
Balance (in Shares) at Dec. 31, 2010 18,827        
Issuance of common stock 6 7,793     7,799
Issuance of common stock (in Shares) 536        
Restricted stock activity   74     74
Restricted stock activity (in Shares) 206        
Net Income     34,157   34,157
Other comprehensive income (loss):          
Energy swap adjustment, net of tax       (925) (925)
Pension benefits adjustment, net of tax       (2,071) (2,071)
Balance at Dec. 31, 2011 194 124,817 82,229 (10,679) 196,561
Balance (in Shares) at Dec. 31, 2011 19,569        
Issuance of common stock 1 3,603     3,604
Issuance of common stock (in Shares) 100        
Restricted stock activity   620     620
Restricted stock activity (in Shares) 215        
Net Income     4,063   4,063
Other comprehensive income (loss):          
Energy swap adjustment, net of tax       448 448
Pension benefits adjustment, net of tax       307 307
Balance at Dec. 31, 2012 195 129,040 86,292 (9,924) 205,603
Balance (in Shares) at Dec. 31, 2012 19,884        
Issuance of common stock 8 6,019     6,027
Issuance of common stock (in Shares) 862        
Restricted stock activity   1,369     1,369
Restricted stock activity (in Shares) 58        
Net Income     30,515   30,515
Other comprehensive income (loss):          
Energy swap adjustment, net of tax       151 151
Pension benefits adjustment, net of tax       3,565 3,565
Balance at Dec. 31, 2013 $ 203 $ 136,428 $ 116,807 $ (6,208) $ 247,230
Balance (in Shares) at Dec. 31, 2013 20,804