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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Loss Contingencies [Line Items]      
Rent expense under cancelable and non-cancelable operating leases $ 3,800 $ 3,100 $ 1,900
Deposits held as collateral for outstanding irrevocable standby letters of credit 504 $ 504  
Outstanding performance and surety bonds 147,700    
Non-refundable deposits 61,500    
Remaining purchase price of land 375,700    
Project Construction Commitment      
Loss Contingencies [Line Items]      
Construction project commitments $ 270,700    
Letter of Credit      
Loss Contingencies [Line Items]      
Term of letter of credit (in months) 1 year