Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Fair Value and Carrying Value of Significant Fixed Rate Long-Term Debt (Details)

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Fair Value Measurements - Fair Value and Carrying Value of Significant Fixed Rate Long-Term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Mar. 10, 2017
May 09, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Carrying Value $ 909,076 $ 945,083    
Mortgage Notes        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair Value 207,022 218,402    
Carrying Value 205,521 215,196    
Other        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair Value 0 20,437    
Carrying Value 0 20,588    
5.0% Notes        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair Value 292,166 262,515    
Carrying Value $ 289,273 289,273    
Stated interest rate 5.00%     5.00%
6.125% Notes        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair Value $ 255,000 216,250    
Carrying Value $ 250,000 $ 250,000    
Stated interest rate 6.125%   6.125%