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Basis of Presentation and Summary of Significant Accounting Policies - Reclassifications (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Net change in net cash used in investing activities $ 175,414 $ (209,088) $ 1,078,749  
Accounting Standards Update 2016-18        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Net change in net cash used in investing activities   (9,194) 8,200  
Restricted Cash   0 6,650 $ 4,100
Restatement Adjustment | Accounting Standards Update 2016-18        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Net change in net cash used in investing activities   (6,650) (2,550)  
Restatement Adjustment | General and Administrative Expense        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Reclassification of non-recoverable payroll   $ (3,706) $ (4,877)