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Subsequent Events (Details)
3 Months Ended 12 Months Ended
Feb. 01, 2019
USD ($)
shares
Jan. 23, 2019
USD ($)
property
site
Feb. 01, 2018
shares
Mar. 31, 2019
USD ($)
Dec. 31, 2018
shares
Dec. 31, 2017
shares
Dec. 31, 2016
shares
Subsequent Event              
Subsequent Event [Line Items]              
Number of properties sold | property   5          
Number of sites sold | site   1,463          
Proceeds from disposal group   $ 89,700,000          
Scenario, Forecast | Subsequent Event              
Subsequent Event [Line Items]              
Gain on sale of properties       $ 53.0      
Restricted Stock              
Subsequent Event [Line Items]              
Grants in period (in shares) | shares     70,250   192,505 130,426 133,717
Management | Restricted Stock | Subsequent Event              
Subsequent Event [Line Items]              
Grants in period (in shares) | shares 61,200            
Value of grants issued $ 6,500,000