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Investments in Non-Controlled Entities (Details) (USD $)
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3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
Texas Frontera Llc [Member]
bbl
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Jun. 30, 2014
Osage Pipeline Co [Member]
mi
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Jun. 30, 2014
Double Eagle Pipeline Llc [Member]
mi
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Jun. 30, 2014
Double Eagle Pipeline Llc [Member]
mi
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Dec. 31, 2013
Double Eagle Pipeline Llc [Member]
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Jun. 30, 2014
BridgeTex [Member]
mi
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Jun. 30, 2014
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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Jun. 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 | $ 800,000 | $ 1,300,000 | |||||||||||||||
| 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] | |||||||||||||||||
| Investment at December 31, 2013 | 360,852,000 | 246,875,000 | 113,977,000 | ||||||||||||||
| Additional investment | 285,945,000 | 99,667,000 | 281,803,000 | 4,142,000 | |||||||||||||
| Other adjustment to investment | (650,000) | 0 | (650,000) | ||||||||||||||
| Proportionate share of earnings (loss) | 2,796,000 | (140,000) | 2,936,000 | ||||||||||||||
| Amortization of excess investment and capitalized interest | (375,000) | 0 | (375,000) | ||||||||||||||
| Earnings (losses) of non-controlled entities | 1,955,000 | 736,000 | 2,421,000 | 2,787,000 | (140,000) | 2,561,000 | |||||||||||
| Distributions of earnings from investments in non-controlled entities | 1,713,000 | 1,302,000 | 0 | 1,713,000 | |||||||||||||
| Distributions in excess of earnings of non-controlled entities | 1,765,000 | 750,000 | 0 | 1,765,000 | |||||||||||||
| Investment at June 30, 2014 | 645,090,000 | 645,090,000 | 528,538,000 | 116,552,000 | |||||||||||||
| Equity Method Investment, Summarized Financial Information, Current Assets | 80,424,000 | 80,424,000 | 60,296,000 | 20,128,000 | |||||||||||||
| Equity Method Investment, Summarized Financial Information, Noncurrent Assets | 1,092,213,000 | 1,092,213,000 | 907,337,000 | 184,876,000 | |||||||||||||
| Equity Method Investment, Summarized Financial Information, Assets | 1,172,637,000 | 1,172,637,000 | 967,633,000 | 205,004,000 | |||||||||||||
| Equity Method Investment, Summarized Financial Information, Current Liabilities | 114,152,000 | 114,152,000 | 107,742,000 | 6,410,000 | |||||||||||||
| Equity Method Investment, Summarized Financial Information, Noncurrent Liabilities | 98,000 | 98,000 | 0 | 98,000 | |||||||||||||
| Equity Method Investment, Summarized Financial Information, Liabilities | 114,250,000 | 114,250,000 | 107,742,000 | 6,508,000 | |||||||||||||
| Equity Method Investment Summarized Financial Information, Equity | 1,058,387,000 | 1,058,387,000 | 859,891,000 | 198,496,000 | |||||||||||||
| Equity Method Investment, Summarized Financial Information, Revenue | 18,464,000 | 0 | 18,464,000 | ||||||||||||||
| Equity Method Investment, Summarized Financial Information, Net Income (Loss) | $ 5,591,000 | $ (280,000) | $ 5,871,000 | ||||||||||||||