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Consolidated Condensed Statements of Stockholders' Equity (Unaudited) (USD $)
In Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Noncontrolling Interest [Member]
Total
Balance at Dec. 31, 2012 $ 332 $ 82,679 $ 246,349 $ 2,563 $ 331,923
Balance (in Shares) at Dec. 31, 2012 33,164        
Net income     14,869   14,869
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards   179     179
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in Shares) 57        
Tax benefits from share-based payment arrangement exercises   143     143
Share-based payment arrangement compensation expense   651     651
Dividends on common stock     (1,107)   (1,107)
Income before income taxes attributable to noncontrolling interest       84 84
Noncontrolling interest distributions       (84) (84)
Change to equity method of accounting       (2,563) (2,563)
Balance at Jun. 30, 2013 332 83,652 260,111   344,095
Balance (in Shares) at Jun. 30, 2013 33,221        
Net income     15,278   15,278
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards 1 946     947
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in Shares) 80        
Tax benefits from share-based payment arrangement exercises   46     46
Share-based payment arrangement compensation expense   433     433
Dividends on common stock     (1,662)   (1,662)
Balance at Dec. 31, 2013 333 85,077 273,727   359,137
Balance (in Shares) at Dec. 31, 2013 33,301        
Net income     13,213   13,213
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards 1 965     966
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in Shares) 97        
Tax benefits from share-based payment arrangement exercises   134     134
Share-based payment arrangement compensation expense   611     611
Dividends on common stock     (1,669)   (1,669)
Balance at Jun. 30, 2014 $ 334 $ 86,787 $ 285,271   $ 372,392
Balance (in Shares) at Jun. 30, 2014 33,398