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Stock-based compensation cost (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Stock-Based Compensation Expense [Abstract]          
Stock-based compensation cost $ 2,309 $ 2,045 $ 9,026 $ 4,620  
Less: stock-based compensation cost capitalized (289) (505) (2,735) (1,440)  
Stock-based compensation expense 2,020 1,540 6,291 3,180  
Payments for stock-based compensation 699 135 2,787 1,433  
Stock-based compensation costs included in accrued payroll and benefits payable 7,305   7,305   5,080
Unrecognized compensation cost $ 19,982   $ 19,982    
Years over which unrecognized compensation cost is expected to be recognized     2 years 3 months 1 day