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Equity Investments (Narrative) (Details) (USD $) | 3 Months Ended | 9 Months Ended |  | 9 Months Ended | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  | 3 Months Ended | 9 Months Ended |  |  | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended |  | 0 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended |
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2014 Apico Llc [Member] acre | Sep. 30, 2014 Tatex Thailand II, LLC [Member] | Sep. 30, 2013 Tatex Thailand II, LLC [Member] | Sep. 30, 2014 Tatex Thailand II, LLC [Member] | Sep. 30, 2013 Tatex Thailand II, LLC [Member] | Dec. 31, 2013 Tatex Thailand II, LLC [Member] | Sep. 30, 2014 Tatex Thailand III, LLC [Member] | Sep. 30, 2013 Tatex Thailand III, LLC [Member] | Sep. 30, 2014 Tatex Thailand III, LLC [Member] acre | Sep. 30, 2013 Tatex Thailand III, LLC [Member] | Dec. 31, 2013 Tatex Thailand III, LLC [Member] | Sep. 30, 2014 Grizzly Oil Sands ULC [Member] | Sep. 30, 2013 Grizzly Oil Sands ULC [Member] | Sep. 30, 2014 Grizzly Oil Sands ULC [Member] acre | Sep. 30, 2013 Grizzly Oil Sands ULC [Member] | Dec. 31, 2013 Grizzly Oil Sands ULC [Member] | Sep. 30, 2014 Bison Drilling And Field Services LLC [Member] | Sep. 30, 2013 Bison Drilling And Field Services LLC [Member] | Sep. 30, 2014 Bison Drilling And Field Services LLC [Member] | Sep. 30, 2013 Bison Drilling And Field Services LLC [Member] | Dec. 31, 2013 Bison Drilling And Field Services LLC [Member] | Sep. 30, 2014 Muskie Holdings LLC [Member] | Sep. 30, 2013 Muskie Holdings LLC [Member] | Sep. 30, 2014 Muskie Holdings LLC [Member] | Sep. 30, 2013 Muskie Holdings LLC [Member] | Dec. 31, 2013 Muskie Holdings LLC [Member] | Jul. 01, 2013 Muskie Holdings LLC [Member] | Jul. 01, 2013 Muskie Holdings LLC [Member] Prime Rate [Member] | Sep. 30, 2014 Timber Wolf Terminals LLC [Member] | Sep. 30, 2013 Timber Wolf Terminals LLC [Member] | Sep. 30, 2014 Timber Wolf Terminals LLC [Member] | Sep. 30, 2013 Timber Wolf Terminals LLC [Member] | Dec. 31, 2012 Timber Wolf Terminals LLC [Member] | Dec. 31, 2013 Timber Wolf Terminals LLC [Member] | Sep. 30, 2014 Windsor Midstream LLC [Member] | Sep. 30, 2013 Windsor Midstream LLC [Member] | Sep. 30, 2014 Windsor Midstream LLC [Member] | Sep. 30, 2013 Windsor Midstream LLC [Member] | Dec. 31, 2013 Windsor Midstream LLC [Member] | Sep. 30, 2014 Windsor Midstream LLC [Member] MidMar Gas LLC [Member] | Sep. 30, 2014 Stingray Pressure Pumping LLC [Member] | Sep. 30, 2013 Stingray Pressure Pumping LLC [Member] | Sep. 30, 2014 Stingray Pressure Pumping LLC [Member] | Sep. 30, 2013 Stingray Pressure Pumping LLC [Member] | Dec. 31, 2013 Stingray Pressure Pumping LLC [Member] | Sep. 30, 2014 Blackhawk Midstream LLC [Member] | Sep. 30, 2013 Blackhawk Midstream LLC [Member] | Sep. 30, 2014 Blackhawk Midstream LLC [Member] | Sep. 30, 2013 Blackhawk Midstream LLC [Member] | Dec. 31, 2013 Blackhawk Midstream LLC [Member] | Jan. 28, 2014 Blackhawk Midstream LLC [Member] Ohio Gathering Company, LLC and Ohio Condensate Company, LLC [Member] | Sep. 30, 2014 Diamondback Energy, Inc [Member] | Jun. 30, 2014 Diamondback Energy, Inc [Member] | Nov. 30, 2013 Diamondback Energy, Inc [Member] | Jun. 30, 2013 Diamondback Energy, Inc [Member] | Sep. 30, 2014 Diamondback Energy, Inc [Member] | Sep. 30, 2013 Diamondback Energy, Inc [Member] | Nov. 30, 2013 Diamondback Energy, Inc [Member] | Sep. 30, 2014 Diamondback Energy, Inc [Member] | Sep. 30, 2013 Diamondback Energy, Inc [Member] | Dec. 31, 2013 Diamondback Energy, Inc [Member] | Oct. 11, 2012 Diamondback Energy, Inc [Member] | Sep. 30, 2014 Stingray Energy Services LLC [Member] | Sep. 30, 2013 Stingray Energy Services LLC [Member] | Sep. 30, 2014 Stingray Energy Services LLC [Member] | Sep. 30, 2013 Stingray Energy Services LLC [Member] | Dec. 31, 2013 Stingray Energy Services LLC [Member] | Sep. 30, 2014 Sturgeon Acquisitions LLC [Member] | Sep. 30, 2013 Sturgeon Acquisitions LLC [Member] | Sep. 30, 2014 Sturgeon Acquisitions LLC [Member] | Sep. 30, 2013 Sturgeon Acquisitions LLC [Member] | Dec. 31, 2013 Sturgeon Acquisitions LLC [Member]
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity shares owned by affiliate (shares) |  |  |  |  |  | 85,122 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total shares owned of subaffiliate (shares) |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gas and oil area, reserve (acres) |  |  |  |  |  | 243,000 |  |  |  |  |  |  |  | 245,000 |  |  |  |  | 830,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Income) loss from equity method investments | $ 34,477,000 | $ (51,322,000) | $ (163,567,000) | $ (162,640,000) |  |  | $ (475,000) | $ (170,000) | $ (475,000) | $ (375,000) |  | $ 47,000 | $ 64,000 | $ 217,000 | $ 157,000 |  | $ 4,633,000 | $ 862,000 | $ 8,862,000 | $ 2,125,000 |  | $ (1,273,000) | $ 1,258,000 | $ 331,000 | $ 1,281,000 |  | $ 55,000 | $ 53,000 | $ 488,000 | $ 869,000 |  |  |  | $ 7,000 | $ 0 | $ 7,000 | $ 8,000 |  |  | $ (301,000) | $ (14,000) | $ (504,000) | $ (872,000) |  |  | $ (351,000) | $ (293,000) | $ 1,792,000 | $ (677,000) |  | $ 0 | $ 174,000 | $ (84,787,000) | $ 296,000 |  |  |  |  |  |  | $ 32,412,000 | $ (52,945,000) |  | $ (89,300,000) | $ (165,402,000) |  |  | $ (9,000) | $ (202,000) | $ 26,000 | $ (64,000) |  | $ 0 | $ 0 | $ 0 | $ 0 |
Cash calls paid |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,600,000 |  |  |  |  | 16,600,000 |  |  |  |  | 17,000,000 |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | 2,400,000 |  |  |  |  |  | 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price of sold equity interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 190,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) due to foreign currency translation adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (9,500,000) | 3,900,000 | (10,000,000) | (5,800,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, basis spread on variable rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for equity method investments |  |  | 61,750,000 | 34,936,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,900,000 | 20,700,000 |  |  |  |
Ownership interest |  |  |  |  |  |  | 23.50% |  | 23.50% |  |  | 17.90% |  | 17.90% |  |  | 24.9999% |  | 24.9999% |  |  | 40.00% |  | 40.00% |  |  | 25.00% |  | 25.00% |  |  |  |  | 50.00% |  | 50.00% |  |  |  | 22.50% |  | 22.50% |  |  | 28.40% | 50.00% |  | 50.00% |  |  | 50.00% |  | 50.00% |  |  |  | 1.70% |  |  |  | 1.70% |  |  | 1.70% |  |  |  | 50.00% |  | 50.00% |  |  | 25.00% |  | 25.00% |  |
Amount put in escrow |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions received |  |  | 476,000 | 203,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 84,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 942,000 |  |  |  | 942,000 |  |  | 942,000 |  |  | 7,914,036 |  |  |  |  |  |  |  |  |  |
Equity investments and investments in subsidiaries | 373,215,000 |  | 373,215,000 |  | 440,068,000 |  |  |  |  |  |  | 12,190,000 |  | 12,190,000 |  | 10,774,000 | 189,182,000 |  | 189,182,000 |  | 191,473,000 | 28,950,000 |  | 28,950,000 |  | 12,318,000 | 8,056,000 |  | 8,056,000 |  | 7,544,000 |  |  | 995,000 |  | 995,000 |  |  | 1,001,000 | 13,531,000 |  | 13,531,000 |  | 10,632,000 |  | 20,040,000 |  | 20,040,000 |  | 19,624,000 | 0 |  | 0 |  | 0 |  | 70,443,000 |  |  |  | 70,443,000 |  |  | 70,443,000 |  | 178,708,000 | 138,500,000 | 4,854,000 |  | 4,854,000 |  | 3,800,000 | 20,688,000 |  | 20,688,000 |  | 0
Number of shares issued in transaction (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,437,500 | 1,000,000 | 2,300,000 | 2,234,536 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds received from sale of stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 197,600,000 | $ 197,600,000 |  |  |  |  | $ 192,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price (usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 74.78 |  |  |  | $ 74.78 |  |  | $ 74.78 |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities. + 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=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Article 5 + 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=31042434&loc=d3e3213-108585 + Details
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- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition Cash received on stock transaction after deduction of issuance costs. + References No definition available. + Details
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- Definition The number of shares issued or sold by the subsidiary or equity method investee per stock transaction. + References No definition available. + Details
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- Definition Price of a single share of a number of saleable stocks of a company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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