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Stock-based compensation cost (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Stock-Based Compensation Expense [Abstract]      
Stock-based compensation cost $ 2,531 $ 1,893  
Less: stock-based compensation cost capitalized (962) (579)  
Stock-based compensation expense 1,569 1,314  
Payments for stock-based compensation 874 69  
Stock-based compensation costs included in accrued payroll and benefits payable 5,951   5,080
Unrecognized compensation cost $ 19,103    
Years over which unrecognized compensation cost is expected to be recognized 2 years 8 months 10 days