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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2021
Fair Value Disclosures [Abstract] |
Schedule of Fair Value Hierarchy, Measured on Recurring Basis | The commodity contracts for our Utilities segments are valued using the market approach and include forward strip pricing at liquid delivery points, exchange-traded futures, options, basis swaps and over-the-counter swaps and options (Level 2) for wholesale electric energy and natural gas contracts. For exchange-traded futures, options and basis swap assets and liabilities, fair value was derived using broker quotes validated by the exchange settlement pricing for the applicable contract. For over-the-counter instruments, the fair value is obtained by utilizing a nationally recognized service that obtains observable inputs to compute the fair value, which we validate by comparing our valuation with the counterparty. The fair value of these swaps includes a CVA based on the credit spreads of the counterparties when we are in an unrealized gain position or on our own credit spread when we are in an unrealized loss position. For additional information, see Note 1 of our Notes to the Consolidated Financial Statements in our 2020 Annual Report on Form 10-K.
| As of September 30, 2021
| Level 1 | Level 2 | Level 3 |  | Cash Collateral and Counterparty Netting (a) | Total
| (in thousands)
Assets: |  |  |  |  |  |
Commodity derivatives — Gas Utilities | $ | — |  | $ | 32,298 |  | $ | — |  |  | $ | (18,370) |  | $ | 13,928 |
Commodity derivatives — Electric Utilities | $ | — |  | $ | — |  | $ | — |  |  | $ | — |  | $ | — |
Total | $ | — |  | $ | 32,298 |  | $ | — |  |  | $ | (18,370) |  | $ | 13,928 |
Liabilities: |  |  |  |  |  |
Commodity derivatives — Gas Utilities | $ | — |  | $ | 1,128 |  | $ | — |  |  | $ | (141) |  | $ | 987 |
Commodity derivatives — Electric Utilities | $ | — |  | $ | 2,484 |  | $ | — |  |  | $ | — |  | $ | 2,484 |
Total | $ | — |  | $ | 3,612 |  | $ | — |  |  | $ | (141) |  | $ | 3,471 |
__________ (a) As of September 30, 2021, $18 million of our commodity derivative assets and $0.1 million of our commodity derivative liabilities, as well as related collateral amounts, were subject to master netting agreements. Collateral amounts are included in Other current assets on the Condensed Consolidated Balance Sheets.
| As of December 31, 2020
| Level 1 | Level 2 | Level 3 |  | Cash Collateral and Counterparty Netting (a) | Total
| (in thousands)
Assets: |  |  |  |  |  |
Commodity derivatives — Gas Utilities | $ | — |  | $ | 2,504 |  | $ | — |  |  | $ | (1,527) |  | $ | 977 |
Commodity derivatives — Electric Utilities | $ | — |  | $ | 1,065 |  | $ | — |  |  | $ | — |  | $ | 1,065 |
Total | $ | — |  | $ | 3,569 |  | $ | — |  |  | $ | (1,527) |  | $ | 2,042 |
Liabilities: |  |  |  |  |  |
Commodity derivatives — Gas Utilities | $ | — |  | $ | 2,675 |  | $ | — |  |  | $ | (1,552) |  | $ | 1,123 |
Commodity derivatives — Electric Utilities | $ | — |  | $ | 921 |  | $ | — |  |  | $ | — |  | $ | 921 |
Total | $ | — |  | $ | 3,596 |  | $ | — |  |  | $ | (1,552) |  | $ | 2,044 |
__________ (a) As of December 31, 2020, $1.5 million of our commodity derivative assets and $1.6 million of our commodity derivative liabilities, as well as related collateral amounts, were subject to master netting agreements. Collateral amounts are included in Other current assets on the Condensed Consolidated Balance Sheets.
Fair Value, by Balance Sheet Grouping | The following table presents the carrying amounts and fair values of financial instruments not recorded at fair value on the Condensed Consolidated Balance Sheets (in thousands) as of:
| September 30, 2021 |  | December 31, 2020
| Carrying Amount | Fair Value |  | Carrying Amount | Fair Value
Long-term debt, including current maturities (a) | $ | 4,125,571 |  | $ | 4,614,244 |  |  | $ | 3,536,536 |  | $ | 4,208,167 |
__________ (a) Long-term debt is valued based on observable inputs available either directly or indirectly for similar liabilities in active markets and therefore is classified as Level 2 in the fair value hierarchy. Carrying amount of long-term debt is net of deferred financing costs.

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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