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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, 2010 $ 220 $ 78,428 $ 215,345 $ 1,911 $ 295,904
Balance (in Shares) at Dec. 31, 2010 21,950        
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards   105     105
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in Shares) 33        
Tax benefits from share-based payment arrangement exercises   167     167
Share-based payment arrangement compensation expense   238     238
Dividends on common stock     (439)   (439)
Income before income taxes attributable to noncontrolling interest       137 137
Noncontrolling interest distributions and other, net       208 208
Net income     4,095   4,095
Balance at Mar. 31, 2011 220 78,938 219,001 2,256 300,415
Balance (in Shares) at Mar. 31, 2011 21,983        
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards   32     32
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in Shares) 2        
Tax benefits from share-based payment arrangement exercises   (3)     (3)
Share-based payment arrangement compensation expense   1,111     1,111
Dividends on common stock     (1,319)   (1,319)
Income before income taxes attributable to noncontrolling interest       670 670
Noncontrolling interest distributions and other, net       (737) (737)
Net income     20,190   20,190
Balance at Dec. 31, 2011 220 80,078 237,872 2,189 320,359
Balance (in Shares) at Dec. 31, 2011 21,985        
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards 1 540     541
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in Shares) 73        
Tax benefits from share-based payment arrangement exercises   272     272
Share-based payment arrangement compensation expense   248     248
Dividends on common stock     (441)   (441)
Income before income taxes attributable to noncontrolling interest       161 161
Noncontrolling interest distributions and other, net       (104) (104)
Net income     5,446   5,446
Balance at Mar. 31, 2012 $ 221 $ 81,138 $ 242,877 $ 2,246 $ 326,482
Balance (in Shares) at Mar. 31, 2012 22,058