Leases (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Lease Cost [Abstract]
Operating Lease Cost		$ 119,000
Amortization of Lease Assets		3,000
Interest on Lease Liabilities		1,000
Variable Lease Cost		31,000
Short-Term Lease Cost		71,000
Total Lease Cost		225,000
Lease Assets and Liabilities [Abstract]
Right-of-Use Assets			$ 566,000
Total		963,000
Current Liabilities		396,294		$ 0
Total		993,000
Finance Lease Net of Accumulated Amortization		33,840,631		33,475,162
Cash Flow Operating And Financing Activities [Abstract]
Operating Leases Non-Cash Leasing Activities		450,000
Operating And Finance Leases Future Minimum Payments [Abstract]
Operating and Finance Leases Not Yet Commenced		752,000
Operating and Finance Leases Liabilities Not Yet Commenced Due in the Remainder of 2019		118,000
Operating and Finance Leases Liabilities Not Yet Commenced Payments Due 2020		429,000
Operating and Finance Leases Liabilities Not Yet Commenced Payments Due 2021		205,000
Operating Leases
Lease Assets and Liabilities [Abstract]
Current Liabilities		396,000
Long-Term Liabilities		$ 529,000
Weighted Average Remaining Lease Term And Discount Rate [Abstract]
Operating Lease Weighted Average Remaining Lease Term (in years)		3 years 3 months 18 days
Operating Lease Weighted Average Discount Rate (%)		3.50%
Operating And Finance Leases Future Minimum Payments [Abstract]
April 1, 2019 to December 31, 2019		$ 328,000
2020		326,000
2021		145,000
2022		87,000
2023		37,000
2024 and Beyond		62,000
Total Lease Payments		985,000
Less: Discount to Present Value		60,000
Total Lease Liabilities		925,000
Operating Leases Future Minimum Payments Due [Abstract]
2019				380,000
2020				213,000
2021				86,000
2022				39,000
2023				30,000
2024 and Beyond				62,000
Total Lease Payments				810,000
Operating Leases | Operating Activities
Cash Flow Operating And Financing Activities [Abstract]
Repayment of Operating Lease Liabilities		52,000
Operating Leases | Investing Activities
Cash Flow Operating And Financing Activities [Abstract]
Repayment of Operating Lease Liabilities		66,000
Finance Leases
Lease Assets and Liabilities [Abstract]
Current Liabilities		15,000
Long-Term Liabilities		$ 53,000
Weighted Average Remaining Lease Term And Discount Rate [Abstract]
Finance Lease Weighted Average Remaining Lease Term (in years)		5 years 6 months
Finance Lease Weighted Average Discount Rate (%)		3.00%
Cash Flow Operating And Financing Activities [Abstract]
Repayment of Finance Lease Liabilities		$ 3,000
Operating And Finance Leases Future Minimum Payments [Abstract]
April 1, 2019 to December 31, 2019		11,000
2020		15,000
2021		15,000
2022		12,000
2023		8,000
2024 and Beyond		14,000
Total Lease Payments		75,000
Less: Discount to Present Value		7,000
Total Lease Liabilities		68,000
Finance Leases Future Minimum Payments Due [Abstract]
2019				15,000
2020				15,000
2021				15,000
2022				12,000
2023				8,000
2024 and Beyond				14,000
Total Lease Payments				$ 79,000
Other Assets | Operating Leases
Lease Assets and Liabilities [Abstract]
Right-of-Use Assets		900,000
Property, Plant and Equipment, Net (1)
Lease Assets and Liabilities [Abstract]
Finance Lease Net of Accumulated Amortization		50,000
Property, Plant and Equipment, Net (1) | Finance Leases
Lease Assets and Liabilities [Abstract]
Right-of-Use Assets	[1]	63,000
Current Portion of Operating Lease Liabilities | Operating Leases
Lease Assets and Liabilities [Abstract]
Current Liabilities		396,000
Current Portion of Long-Term Debt | Finance Leases
Lease Assets and Liabilities [Abstract]
Current Liabilities		15,000
Other Liabilities | Operating Leases
Lease Assets and Liabilities [Abstract]
Long-Term Liabilities		529,000
Long-term Debt | Finance Leases
Lease Assets and Liabilities [Abstract]
Long-Term Liabilities		$ 53,000
Minimum
Operating And Finance Leases Future Minimum Payments [Abstract]
Operating and Finance Leases Not Yet Commenced Lease Term		1 month
Maximum
Operating And Finance Leases Future Minimum Payments [Abstract]
Operating and Finance Leases Not Yet Commenced Lease Term		10 years

[1] Finance lease assets are recorded net of accumulated amortization of $50 million at March 31, 2019.