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Stock-Based Compensation Cost (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Stock-Based Compensation Expense [Abstract]          
Stock-based compensation cost $ 1,244 $ 1,362 $ 3,048 $ 3,037  
Less: stock-based compensation cost capitalized (457) (555) (1,110) (1,164)  
Stock-based compensation expense 787 807 1,938 1,873  
Payments for stock-based compensation 800 276 862 276  
Stock-based compensation costs included in accrued payroll and benefits payable 2,590   2,590   2,359
Unrecognized compensation cost $ 14,232   $ 14,232    
Years over which unrecognized compensation cost is expected to be recognized     3 years 0 months 0 days