Leases Operating Lease Information (Details)	Mar. 31, 2019
Lessee, Lease, Description [Line Items]
Weighted-average lease term (in years)	7 years 3 months 10 days
Weighted-average discount rate	3.42%
Equipment
Lessee, Lease, Description [Line Items]
Weighted-average lease term (in years)	1 year 4 months 9 days
Weighted-average discount rate	2.73%
Retail and corporate offices
Lessee, Lease, Description [Line Items]
Weighted-average lease term (in years)	6 years 5 months 15 days
Weighted-average discount rate	3.43%
Land
Lessee, Lease, Description [Line Items]
Weighted-average lease term (in years)	12 years 2 months 8 days
Weighted-average discount rate	3.39%