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Investments in Non-Controlled Entities (Details) (USD $)
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3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 9 Months Ended | ||||||||||
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
Texas Frontera Llc [Member]
bbl
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Sep. 30, 2014
Osage Pipeline Co [Member]
mi
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Sep. 30, 2014
Double Eagle Pipeline Llc [Member]
mi
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Sep. 30, 2013
Double Eagle Pipeline Llc [Member]
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Sep. 30, 2014
Double Eagle Pipeline Llc [Member]
mi
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Sep. 30, 2013
Double Eagle Pipeline Llc [Member]
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Dec. 31, 2013
Double Eagle Pipeline Llc [Member]
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Sep. 30, 2014
BridgeTex [Member]
mi
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Dec. 31, 2013
BridgeTex [Member]
Sale of Emission Reduction Credits [Member]
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Jun. 30, 2014
BridgeTex [Member]
Sale of Emission Reduction Credits [Member]
Income Statement [Member]
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Jun. 30, 2014
BridgeTex [Member]
Sale of Emission Reduction Credits [Member]
Deferred Income [Member]
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Dec. 31, 2013
BridgeTex [Member]
Sale of Easement Rights [Member]
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Dec. 31, 2013
BridgeTex [Member]
Sale of Easement Rights [Member]
Income Statement [Member]
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Dec. 31, 2013
BridgeTex [Member]
Sale of Easement Rights [Member]
Deferred Income [Member]
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Sep. 30, 2014
All Other Equity Investments [Member]
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| Schedule of Equity Method Investments [Line Items] | |||||||||||||||||||
| Interest in equity method investment | 50.00% | 50.00% | 50.00% | 50.00% | 50.00% | ||||||||||||||
| Storage Capacity | 1,000,000 | ||||||||||||||||||
| Pipeline Length | 135 | 195 | 195 | 450 | |||||||||||||||
| Related Party Transaction, Other Revenues from Transactions with Related Party | $ 700,000 | $ 500,000 | $ 2,000,000 | $ 800,000 | |||||||||||||||
| Accounts Receivable, Related Parties, Current | 300,000 | 300,000 | 200,000 | ||||||||||||||||
| Related Party Transaction, Amounts of Transaction | (4,800,000) | (2,400,000) | (2,400,000) | (1,400,000) | (700,000) | (700,000) | |||||||||||||
| Change in Equity Method Investments [Roll Forward] | |||||||||||||||||||
| Investments at December 31, 2013 | 360,852,000 | 246,875,000 | 113,977,000 | ||||||||||||||||
| Additional investment | 378,220,000 | 181,377,000 | 368,869,000 | 9,351,000 | |||||||||||||||
| Other adjustment to investment | (650,000) | 0 | (650,000) | ||||||||||||||||
| Proportionate share of earnings | 4,629,000 | 9,000 | 4,620,000 | ||||||||||||||||
| Amortization of excess investment and capitalized interest | (563,000) | 0 | (563,000) | ||||||||||||||||
| Earnings of non-controlled entities | 1,645,000 | 2,375,000 | 4,066,000 | 5,162,000 | 9,000 | 4,057,000 | |||||||||||||
| Distributions of earnings from investments in non-controlled entities | 2,398,000 | 1,907,000 | 0 | 2,398,000 | |||||||||||||||
| Distributions in excess of earnings of non-controlled entities | 3,918,000 | 604,000 | 0 | 3,918,000 | |||||||||||||||
| Investments at September 30, 2014 | 736,172,000 | 736,172,000 | 615,753,000 | 120,419,000 | |||||||||||||||
| Equity Method Investment, Summarized Financial Information, Current Assets | 86,446,000 | 86,446,000 | 67,027,000 | 19,419,000 | |||||||||||||||
| Equity Method Investment, Summarized Financial Information, Noncurrent Assets | 1,241,788,000 | 1,241,788,000 | 1,043,761,000 | 198,027,000 | |||||||||||||||
| Equity Method Investment, Summarized Financial Information, Assets | 1,328,234,000 | 1,328,234,000 | 1,110,788,000 | 217,446,000 | |||||||||||||||
| Equity Method Investment, Summarized Financial Information, Current Liabilities | 110,547,000 | 110,547,000 | 99,808,000 | 10,739,000 | |||||||||||||||
| Equity Method Investment, Summarized Financial Information, Noncurrent Liabilities | 99,000 | 99,000 | 0 | 99,000 | |||||||||||||||
| Equity Method Investment, Summarized Financial Information, Liabilities | 110,646,000 | 110,646,000 | 99,808,000 | 10,838,000 | |||||||||||||||
| Equity Method Investment Summarized Financial Information, Equity | 1,217,588,000 | 1,217,588,000 | 1,010,980,000 | 206,608,000 | |||||||||||||||
| Equity Method Investment, Summarized Financial Information, Revenue | 27,774,000 | 428,000 | 27,346,000 | ||||||||||||||||
| Equity Method Investment, Summarized Financial Information, Net Income (Loss) | $ 9,258,000 | $ 17,000 | $ 9,241,000 | ||||||||||||||||