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Stock-Based Compensation Cost (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Stock-Based Compensation Expense [Abstract]          
Stock-based compensation cost $ 1,725 $ 1,179 $ 4,773 $ 4,216  
Less: stock-based compensation cost capitalized (605) (439) (1,715) (1,603)  
Stock-based compensation expense 1,120 740 3,058 2,613  
Payments for stock-based compensation 120 326 981 602  
Stock-based compensation costs included in accrued payroll and benefits payable 2,472   2,472   2,359
Unrecognized compensation cost $ 15,405   $ 15,405    
Years over which unrecognized compensation cost is expected to be recognized     3 years 0 months 0 days