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Lease Obligations - Summary of the lease terms and discount rates (Details)
Mar. 31, 2019
Lease, Cost [Abstract]  
Weighted-average remaining lease term - finance leases 2 years 1 month 20 days
Weighted-average remaining lease term - operating leases 4 years 3 months 21 days
Weighted-average discount rate - finance leases 2.50%
Weighted-average discount rate - operating leases 3.80%