Annual report pursuant to Section 13 and 15(d)

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

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Fair Value Measurements - Fair Value and Carrying Value of Fixed Rate Long-Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Mar. 10, 2017
May 09, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Long-term Debt, Carrying Value $ 945,083 $ 1,024,703    
5.0% Notes        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Long-term Debt, Fair Value 262,515 279,148    
Long-term Debt, Carrying Value $ 289,273 $ 289,273    
Stated interest rate on debt agreement 5.00% 5.00%   5.00%
6.125% Notes        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Long-term Debt, Fair Value $ 216,250 $ 248,750    
Long-term Debt, Carrying Value $ 250,000 $ 250,000    
Stated interest rate on debt agreement 6.125% 6.125% 6.125%  
Mortgage Notes        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Long-term Debt, Fair Value $ 218,402 $ 203,031    
Long-term Debt, Carrying Value 215,196 199,972    
Other        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Long-term Debt, Fair Value 20,437 3,760    
Long-term Debt, Carrying Value $ 20,588 $ 3,947