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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        
Net income     16,622   16,622
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards   137     137
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in Shares) 35        
Tax benefits from share-based payment arrangement exercises   164     164
Share-based payment arrangement compensation expense   930     930
Dividends on common stock     (1,318)   (1,318)
Income before income taxes attributable to noncontrolling interest       708 708
Noncontrolling interest distributions       (13) (13)
Balance at Sep. 30, 2011 220 79,659 230,649 2,606 313,134
Balance (in Shares) at Sep. 30, 2011 21,985        
Net income     7,663   7,663
Share-based payment arrangement compensation expense   419     419
Dividends on common stock     (440)   (440)
Income before income taxes attributable to noncontrolling interest       99 99
Noncontrolling interest distributions       (516) (516)
Balance at Dec. 31, 2011 220 80,078 237,872 2,189 320,359
Balance (in Shares) at Dec. 31, 2011 21,985        
Net income     19,548   19,548
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards 1 615     616
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in Shares) 86        
Tax benefits from share-based payment arrangement exercises   350     350
Share-based payment arrangement compensation expense   1,047     1,047
Dividends on common stock     (1,545)   (1,545)
Income before income taxes attributable to noncontrolling interest       467 467
Noncontrolling interest distributions       (230) (230)
Balance at Sep. 30, 2012 $ 221 $ 82,090 $ 255,875 $ 2,426 $ 340,612
Balance (in Shares) at Sep. 30, 2012 22,071