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Rates and Other Regulatory Activities Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Rates and Other Regulatory Activities [Line Items] |  |  |
Regulatory Assets |  | $ 77,218 | $ 86,505
Regulatory Liabilities |  | 142,922 | 147,463
Self Insured Liabilities [Member] |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |
Regulatory Liabilities | [1] | 947 | 1,013
Overrecovered Gas And Fuel Costs [Member] |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |
Regulatory Liabilities | [2] | 5,443 | 2,048
Storm Reserve [Member] |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |
Regulatory Liabilities | [1] | 677 | 669
Accrued asset removal cost |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |
Regulatory Liabilities | [3] | 42,401 | 40,948
Deferred Income Tax Due to Rate Change [Member] |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |
Regulatory Liabilities | [4] | 91,162 | 98,492
Other Regulatory Liability [Member] |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |
Regulatory Liabilities |  | 729 | 2,048
Underrecovered Gas And Fuel Costs [Member] |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |
Regulatory Assets | [2] | 4,631 | 9,869
Under-recovered GRIP Revenue [Member] |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |
Regulatory Assets | [5] | 165 | 164
Regulatory Liabilities | [5] | 1,563 | 2,245
Deferred Post Retirement Benefits [Member] |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |
Regulatory Assets | [6] | 15,517 | 15,498
Deferred Conversion And Development Costs [Member] |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |
Regulatory Assets | [2] | 16,727 | 11,735
Environmental Regulatory Assets And Expenditures [Member] |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |
Regulatory Assets | [7] | 2,731 | 3,222
Acquisition Adjustment [Member] |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |
Regulatory Assets | [8] | 33,255 | 39,992
Loss on Reacquired Debt [Member] |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |
Regulatory Assets | [9] | 942 | 1,031
Other Regulatory Asset [Member] |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |
Regulatory Assets |  | 3,250 | $ 4,994
Florida Public Utilities Company [Member] |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |
Business Acquisition Premium Paid |  | 34,200 |
Regulatory Liabilities |  | 19,505 |
Indiantown Gas Company |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |
Business Acquisition Premium Paid |  | 746 |
FPU Pension Plan |  |  |
Rates and Other Regulatory Activities [Line Items] |  |  |
Merger Related Costs Allowed To Be Recovered In Future Rates |  | $ 500 |
[1] | We have self-insurance and storm reserves in our Florida regulated energy operations that allow us to collect through rates amounts to be used against general claims, storm restoration costs and other losses as they are incurred.
[2] | We are allowed to recover the asset or are required to pay the liability in rates. We do not earn an overall rate of return on these assets.
[3] | See Note 1, Summary of Significant Accounting Policies, for additional information on our asset removal cost policies.
[4] | We recorded a regulatory liability for our regulated businesses related to the revaluation of accumulated deferred tax assets/liabilities as a result of the TCJA. Based upon the regulatory proceedings, we will pass back the respective portion of the excess accumulated deferred taxes to rate payers. See Note 12, Income Taxes, for additional information.
[5] | The Florida PSC allowed us to recover through a surcharge, capital and other program-related-costs, inclusive of an appropriate return on investment, associated with accelerating the replacement of qualifying distribution mains and services (defined as any material other than coated steel or plastic) in FPU’s natural gas distribution, Fort Meade division and Chesapeake Utilities’ Central Florida Gas division. We are allowed to recover the asset or are required to pay the liability in rates related to GRIP.
[6] | The Florida PSC allowed FPU to treat as a regulatory asset the portion of the unrecognized costs pursuant to ASC Topic 715, Compensation - Retirement Benefits, related to its regulated operations. See Note 17, Employee Benefit Plans, for additional information.
[7] | All of our environmental expenditures incurred to date and our current estimate of future environmental expenditures have been approved by various PSCs for recovery. See Note 20, Environmental Commitments and Contingencies, for additional information on our environmental contingencies.
[8] | We are allowed to include the premiums paid in various natural gas utility acquisitions in Florida in our rate bases and recover them over a specific time period pursuant to the Florida PSC approvals. Included in these amounts are $543,000 of the premium paid by FPU, $34.2 million of the premium paid by us in 2009, including a gross up for income tax, because it is not tax deductible, and $746,000 of the premium paid by FPU in 2010.
[9] | Gains and losses resulting from the reacquisition of long-term debt are amortized over future periods as adjustments to interest expense in accordance with established regulatory practice.

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