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Mortgage Notes Payable, Credit Facilities and Senior Notes (Carrying Value of Debt) (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Jul. 26, 2016
Sep. 29, 2015
Dec. 03, 2014
Dec. 09, 2013
Debt Instrument [Line Items]            
Credit Facility: $ 313,737,000 $ 95,654,000        
Term Loan Agreement            
Debt Instrument [Line Items]            
Long term debt 300,000,000 300,000,000   $ 300,000,000    
Net unamortized deferred financing costs (1,247,000) (809,000)        
Term Loan: 298,753,000 299,191,000        
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 (2,657,000) (2,891,000)        
Net unamortized deferred financing costs (1,590,000) (1,755,000)        
Senior Notes 245,753,000 245,354,000        
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 (2,835,000) (3,119,000)        
Net unamortized deferred financing costs (1,632,000) (1,830,000)        
Senior Notes 245,533,000 245,051,000        
Senior Notes Due 2026            
Debt Instrument [Line Items]            
Senior Notes 199,745,000 199,727,000        
Revolving Credit Facility            
Debt Instrument [Line Items]            
Credit Facility 317,000,000 98,000,000        
Net unamortized deferred financing costs (3,263,000) (2,346,000)        
Credit Facility: 313,737,000 95,654,000        
Senior Notes | 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 (255,000) (273,000)        
Senior Notes $ 199,745,000 $ 199,727,000