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Financing Obligations - Narrative (Details) - Financing Obligation
$ in Millions
1 Months Ended 3 Months Ended
Mar. 31, 2019
USD ($)
Oct. 31, 2017
USD ($)
property
Dec. 31, 2018
USD ($)
property
Debt Instrument [Line Items]      
Sale leaseback transaction, number of properties | property   42 2
Sale leaseback transaction, gross proceeds | $ $ 4.7 $ 119.5 $ 6.4