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Consolidated Statements of Stockholders' Equity (USD $)
In Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Noncontrolling Interest [Member]
Total
Balance at Dec. 31, 2010 $ 329 $ 78,428 $ 215,236 $ 1,911 $ 295,904
Balance (in Shares) at Dec. 31, 2010 32,925        
Net income     24,285   24,285
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards 1 137 (1)   137
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in Shares) 52        
Tax benefits from share-based payment arrangement exercises   164     164
Share-based payment arrangement compensation expense   1,349     1,349
Dividends on common stock     (1,758)   (1,758)
Income before income taxes attributable to noncontrolling interest       807 807
Noncontrolling interest distributions       (529) (529)
Balance at Dec. 31, 2011 330 80,078 237,762 2,189 320,359
Balance (in Shares) at Dec. 31, 2011 32,977        
Net income     27,267   27,267
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards 2 967 (1)   968
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in Shares) 187        
Tax benefits from share-based payment arrangement exercises   409     409
Share-based payment arrangement compensation expense   1,225     1,225
Dividends on common stock     (18,679)   (18,679)
Income before income taxes attributable to noncontrolling interest       497 497
Noncontrolling interest distributions       (123) (123)
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     30,147   30,147
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards 1 1,125     1,126
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in Shares) 137        
Tax benefits from share-based payment arrangement exercises   189     189
Share-based payment arrangement compensation expense   1,084     1,084
Dividends on common stock     (2,769)   (2,769)
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 Dec. 31, 2013 $ 333 $ 85,077 $ 273,727   $ 359,137
Balance (in Shares) at Dec. 31, 2013 33,301