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Mortgage Notes Payable, Credit Facilities and Senior Notes - Carrying Value of the Company’s Senior Notes (Details) - USD ($)
Dec. 31, 2017
Nov. 10, 2017
Dec. 31, 2016
Jul. 26, 2016
Sep. 29, 2015
Dec. 03, 2014
Dec. 09, 2013
Debt Instrument [Line Items]              
Long-term debt $ 106,320,000   $ 70,683,000        
Net unamortized deferred financing costs (326,000)   (417,000)        
Long-term Debt 298,816,000   299,191,000        
Credit facility 140,329,000   95,654,000        
Senior Notes Due 2027              
Debt Instrument [Line Items]              
Principal amount 250,000,000 $ 250,000,000 0        
Net unamortized deferred financing costs (1,249,000)   0        
Senior Notes 248,751,000   0        
Term Loan Agreement              
Debt Instrument [Line Items]              
Long-term debt 300,000,000   300,000,000        
Principal amount         $ 300,000,000.0    
Net unamortized deferred financing costs (1,184,000)   (809,000)        
Long-term Debt 298,816,000   299,191,000        
Senior Notes Due 2026              
Debt Instrument [Line Items]              
Principal amount 200,000,000   200,000,000 $ 200,000,000.0      
Net unamortized deferred financing costs (248,000)   (273,000)        
Senior Notes 199,752,000   199,727,000        
Senior Notes Due 2024              
Debt Instrument [Line Items]              
Long-term debt 250,000,000   250,000,000        
Principal amount           $ 250,000,000.0  
Unamortized debt discount (2,578,000)   (2,891,000)        
Net unamortized deferred financing costs (1,535,000)   (1,755,000)        
Senior Notes 245,887,000   245,354,000        
Senior Notes Due 2023              
Debt Instrument [Line Items]              
Long-term debt 250,000,000   250,000,000        
Principal amount             $ 250,000,000.0
Unamortized debt discount (2,737,000)   (3,119,000)        
Net unamortized deferred financing costs (1,567,000)   (1,830,000)        
Senior Notes 245,696,000   245,051,000        
Revolving Credit Facility              
Debt Instrument [Line Items]              
Credit facility 143,500,000   98,000,000        
Net unamortized deferred financing costs (3,171,000)   (2,346,000)        
Credit facility $ 140,329,000   $ 95,654,000