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Stock-based compensation cost (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Stock-Based Compensation Expense [Abstract]          
Stock-based compensation cost $ 4,186 $ 682 $ 6,717 $ 2,575  
Less: stock-based compensation cost capitalized (1,484) (356) (2,446) (935)  
Stock-based compensation expense 2,702 326 4,271 1,640  
Payments for stock-based compensation 1,214 1,229 2,088 1,298  
Stock-based compensation costs included in accrued payroll and benefits payable 6,659   6,659   5,080
Unrecognized compensation cost $ 21,201   $ 21,201    
Years over which unrecognized compensation cost is expected to be recognized     2 years 6 months 3 days