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Equity Method Investments - Contributions to and Earnings (Loss) on the Company's Equity Method Investments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Schedule of Equity Method Investments [Line Items] |  |  |  |
Contributions | $ 5,036 | $ 16,293 | $ 10,114 | $ 22,230
Earnings (loss) on equity method investments | 1,512 | 756 | 2,933 | 756
Contributions to and earnings (loss) on equity method investments | 6,548 | 17,049 | 13,047 | 22,986
Constitution Pipeline Company, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Contributions | 3,000 | 15,250 | 6,000 | 21,000
Earnings (loss) on equity method investments | 1,528 | 854 | 2,955 | 854
Contributions to and earnings (loss) on equity method investments | 4,528 | 16,104 | 8,955 | 21,854
Meade Pipeline Co LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Contributions | 2,036 | 1,043 | 4,114 | 1,230
Earnings (loss) on equity method investments | (16) | (98) | (22) | (98)
Contributions to and earnings (loss) on equity method investments | $ 2,020 | $ 945 | $ 4,092 | $ 1,132

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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.12) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
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