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Financing Obligations - Narrative (Details)
$ in Millions
 12 Months Ended
Oct. 10, 2017
USD ($)
property
period
Dec. 31, 2017
USD ($)
Leases [Abstract]    
Sale leaseback transaction, number of properties | property 42  
Sale leaseback transaction, gross proceeds, financing activities $ 119.5  
Sale leaseback transaction, lease term, period (in years) 20 years  
Sale leaseback transaction, renewal term, number of additional terms | period 5  
Sale leaseback transaction, length of each additional period (in years) 5 years  
Deferred finance costs, issuance costs   $ 2.7
Non-cash interest expense related to amortization of deferred financing issuance costs   $ 0.1