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Fair Value Measurements (Summary of the Aggregate Carrying Values and Fair Values of Long-Term Fixed Interest Rate Debt) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Carrying value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt $ 660,891 $ 676,880
Fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt $ 665,218 $ 698,087
Senior Notes | Senior Notes Due 2025    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Stated interest rate (percent) 5.25% 5.25%
Senior Notes | Senior Notes Due 2025 | Carrying value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt $ 300,000  
Senior Notes | Senior Notes Due 2025 | Fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt   $ 312,750
Senior Notes | Fair Value, Inputs, Level 1 | Senior Notes Due 2025 | Carrying value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt   300,000
Senior Notes | Fair Value, Inputs, Level 1 | Senior Notes Due 2025 | Fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt 300,750  
Real Estate Mortgages and Other Debt | Carrying value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt 360,891 376,880
Real Estate Mortgages and Other Debt | Fair Value, Inputs, Level 2 | Fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt $ 364,468 $ 385,337