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Fair Value of Financial Instruments (The Waha JVs) (Narrative) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items] |  |  |
Equity method investments, equity in earnings (losses) | $ 29,738,000 | $ 27,367,000 | $ 23,855,000
Equity method investments, net investment | 220,000,000 | 196,000,000 |
Unrealized gains (losses) on equity investee activity, net of tax | (17,151,000) | (15,023,000) | 5,863,000
Waha JVs [Member] |  |  |
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items] |  |  |
Equity method investments, equity in earnings (losses) | 31,300,000 | 27,300,000 | 23,900,000
Equity method investments, distributions of earnings received, operating cash flows | 12,000,000.0 | 9,100,000 | 10,900,000
Equity method investments, cumulative undistributed earnings | 67,300,000 |  |
Equity method investments, equity contributions | 0 | 1,000,000 | 28,000,000
Equity method investments, net investment | 175,000,000 | 174,000,000 |
Unrealized gains (losses) on equity investee activity, before tax | (24,400,000) | (19,900,000) | 7,700,000
Unrealized gains (losses) on equity investee activity, net of tax | $ (18,500,000) | $ (15,000,000.0) | $ 5,900,000

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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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