Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Notes Narrative (Details)

v3.20.2
Long-Term Debt - Notes Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 10, 2017
Jun. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]        
Debt Instrument Percentage Of Outstanding Principal Amount Redeemable Upon Event Of Default   25.00%    
Debt outstanding   $ 757,684,000 $ 757,684,000 $ 714,968,000
Maximum Borrowing 2019 Mortgage Facility   $ 112,200,000 $ 112,200,000  
Mortgage notes        
Debt Instrument [Line Items]        
Debt weighted average interest rate on note   3.56% 3.56%  
Debt outstanding   $ 398,600,000 $ 398,600,000  
5.0% Notes        
Debt Instrument [Line Items]        
Stated interest rate   5.00% 5.00%  
6.125% Notes        
Debt Instrument [Line Items]        
Notes Redemption Price Percentage Of Par Value Due To Change Of Control 101.00%      
Stated interest rate 6.125% 6.125% 6.125%  
Principal amount $ 250,000,000.0      
Notes issued, percent of principal 100.00%      
Maximum dividend (usd per share)   $ 0.12 $ 0.12  
2019 Mortgage Facility [Member]        
Debt Instrument [Line Items]        
Stated interest rate   2.50% 2.50%  
Maximum dividend (usd per share)   $ 0.10 $ 0.10  
Long Term Debt Prepayment   $ 500,000 $ 500,000  
Debt Instrument, Unused Borrowing Capacity, Amount   $ 3,100,000 $ 3,100,000  
Percent of Collateralized Real Estate   75.00% 75.00%  
Minimum | 5.0% Notes        
Debt Instrument [Line Items]        
Debt Instrument Other Outstanding Indebtedness In Excess   $ 50,000,000.0    
Minimum | 2019 Mortgage Facility [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate     0.50%  
Debt Instrument, Basis Spread LIBOR     1.50%  
Maximum | 2019 Mortgage Facility [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate     1.75%  
Debt Instrument, Basis Spread LIBOR     2.75%