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CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (USD $)
In Thousands, unless otherwise specified
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Treasury Stock, at Cost
Non-controlling Interests
Balance at Dec. 31, 2010 $ 151,898 $ 25,413 $ 79,297 $ 58,546 $ (14,418) $ 3,060
Balance (in shares) at Dec. 31, 2010   25,413        
Increase (Decrease) in Stockholders' Equity            
Net income 49,776     45,381   4,395
Contributions from non-controlling interest holders 31         31
Distributions to non-controlling interest holders (5,443)         (5,443)
Share-based compensation expense 2,109   2,109      
Exercise of stock options 775     (2,943) 3,718  
Repurchase of shares (35,471)       (35,471)  
Balance at Sep. 30, 2011 163,675 25,413 81,406 100,984 (46,171) 2,043
Balance (in shares) at Sep. 30, 2011   25,413        
Balance at Dec. 31, 2011 165,943 25,413 83,229 126,161 (72,048) 3,188
Balance (in shares) at Dec. 31, 2011   25,413        
Increase (Decrease) in Stockholders' Equity            
Net income 84,557     80,334   4,223
Contributions from non-controlling interest holders 27         27
Distributions to non-controlling interest holders (6,008)         (6,008)
Share-based compensation expense 2,038   2,038      
Exercise of stock options 2,619     (5,759) 8,378  
Repurchase of shares (16,781)       (16,781)  
Balance at Sep. 30, 2012 $ 232,395 $ 25,413 $ 85,267 $ 200,736 $ (80,451) $ 1,430
Balance (in shares) at Sep. 30, 2012   25,413