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Leasing (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Lessee, Lease, Description [Line Items]    
Renewal term (years) 29 years  
Termination period (days) 30 days  
2019   $ 4.8
2020   4.0
2021   3.6
2022   3.4
2023   3.4
Thereafter   $ 13.0
Minimum    
Lessee, Lease, Description [Line Items]    
Remaining lease term (years) 1 year  
Operating lease renewal term (years)   5 years
Maximum    
Lessee, Lease, Description [Line Items]    
Remaining lease term (years) 23 years  
Operating lease renewal term (years)   20 years