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Debt - Additional Information (Details)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]      
Revolving credit facility $ 79,000,000   $ 81,500,000
Consolidated fixed charge coverage ratio 3.2    
Bank covenant, fixed charge coverage ratio 1.5    
Fixed Rate Debt      
Debt Instrument [Line Items]      
Estimated fair value of debt $ 507,000,000.0   489,000,000.0
Variable rate debt      
Debt Instrument [Line Items]      
Estimated fair value of debt 79,000,000.0 $ 81,500,000 81,500,000
Senior Unsecured Revolving Credit Facility      
Debt Instrument [Line Items]      
Revolving credit facility 79,000,000.0   $ 81,500,000
Maximum borrowing availability under revolving credit facility $ 250,000,000.0