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Basis of Presentation and Summary of Significant Accounting Policies - Recently Issued Accounting Pronouncements Adopted (Details)
$ in Thousands
 12 Months Ended
Jan. 01, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Accounting Policies [Abstract]        
Real estate investment trust required distribution (percent)   90.00%    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Net cash provided by (used in) investing activities   $ 175,414 $ (209,088) $ 1,078,749
Accounting Standards Update 2016-01        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Net unrealized gain on available-for-sale equity securities $ 275      
Accounting Standards Update 2016-18        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Net cash provided by (used in) investing activities     (9,194) $ 8,200
Accounting Standard Update 2017-05        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Impact of ASU     $ 12,756  
Accounting Standards Update 2016-02        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Right-of-use asset   3,000    
Lease liability   $ 3,000    
Accounting Standards Update 2016-02 | Measurement Input, Discount Rate        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Measurement input for finance leased asset   0.044