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Debt - Additional Information (Details)
12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Nov. 05, 2012
USD ($)
Debt Instrument [Line Items]      
Maximum borrowing availability under revolving credit facility $ 250,000,000   $ 175,000,000
Adjusted Funds from Operations, Percent 95.00%    
Outstanding borrowing under the revolving credit facility $ 65,580,000 $ 22,500,000  
Consolidated fixed charge coverage ratio 3.51    
Fixed Rate Debt      
Debt Instrument [Line Items]      
Estimated fair value of debt $ 522,713,000 542,538,000  
Variable rate debt      
Debt Instrument [Line Items]      
Estimated fair value of debt 65,574,000 22,500,000  
Senior Secured Revolving Credit Facility      
Debt Instrument [Line Items]      
Maximum borrowing availability under revolving credit facility 250,000,000    
Outstanding borrowing under the revolving credit facility $ 65,580,000 $ 22,500,000