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Accounting Policies - Project development expenses (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Project development expenses $ 16,964 $ 6,383
Administrative expenses $ 38,867 27,188
Previously Reported    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Project development expenses   0
Administrative expenses   33,571
Restatement Adjustment    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Project development expenses   6,383
Administrative expenses   $ (6,383)