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Mortgage Notes Payable, Credit Facilities and Senior Notes - Carrying Value of the Company’s Unsecured Debt (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Nov. 10, 2017
Jul. 26, 2016
Sep. 29, 2015
Dec. 03, 2014
Dec. 09, 2013
Debt Instrument [Line Items]              
Document Period End Date Dec. 31, 2018            
Credit facility $ 153,689,000 $ 140,329,000          
Senior Notes 941,449,000 940,086,000          
Term Loan Agreement              
Debt Instrument [Line Items]              
Principal amount 300,000,000 300,000,000     $ 300,000,000.0    
Net unamortized deferred financing costs (924,000) (1,184,000)          
Long-term Debt 299,076,000 298,816,000          
Senior Notes              
Debt Instrument [Line Items]              
Principal amount 950,000,000            
Senior Notes | Senior Notes Due 2027              
Debt Instrument [Line Items]              
Principal amount 250,000,000 250,000,000 $ 250,000,000        
Net unamortized deferred financing costs (1,123,000) (1,249,000)          
Senior Notes 248,877,000 248,751,000          
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 (219,000) (248,000)          
Senior Notes 199,781,000 199,752,000          
Senior Notes | Senior Notes Due 2024              
Debt Instrument [Line Items]              
Principal amount 250,000,000 250,000,000       $ 250,000,000.0  
Unamortized debt discount (2,252,000) (2,578,000)          
Net unamortized deferred financing costs (1,314,000) (1,535,000)          
Senior Notes 246,434,000 245,887,000          
Senior Notes | Senior Notes Due 2023              
Debt Instrument [Line Items]              
Principal amount 250,000,000 250,000,000         $ 250,000,000.0
Unamortized debt discount (2,339,000) (2,737,000)          
Net unamortized deferred financing costs (1,304,000) (1,567,000)          
Senior Notes 246,357,000 245,696,000          
Revolving Credit Facility              
Debt Instrument [Line Items]              
Credit facility 156,000,000 143,500,000          
Net unamortized deferred financing costs (2,311,000) (3,171,000)          
Credit facility $ 153,689,000 $ 140,329,000