Leases (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2019	Oct. 01, 2019
Lessee, Lease, Description [Line Items]
Right of Use Asset in Exchange for New Lease Liability	$ 0
Weighted Average Remaining Lease Term	8 years 8 months 12 days
Weighted Average Discount Rate	3.49%
Cash Paid for Operating Liabilities	$ 1,100
Buildings and Property [Member] | Minimum [Member]
Lessee, Lease, Description [Line Items]
Non-Cancelable Lease Term	6 months
Operating Lease Renewal Term	1 year
Buildings and Property [Member] | Maximum [Member]
Lessee, Lease, Description [Line Items]
Non-Cancelable Lease Term	11 years
Operating Lease Renewal Term	14 years
Drilling Rigs [Member] | Maximum [Member]
Lessee, Lease, Description [Line Items]
Non-Cancelable Lease Term	1 year
Guidance for Leases [Member]
Lessee, Lease, Description [Line Items]
Increase in Assets and Liabilities Upon Adoption of Leasing Standard		$ 19,700