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Fair Value Measurements - Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Document Fiscal Year Focus 2018  
Financing Receivable, Net $ 0 $ 15,803
Notes Payable 3,006,478 2,971,715
Unsecured Debt 708,734 623,262
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes Receivable, Fair Value 0 15,660
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes Payable, Fair Value 2,961,769 3,058,044
Fair Value, Inputs, Level 2 [Member] | Unsecured Credit Facilities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Fair Value Disclosure $ 710,902 $ 625,000