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Equity Investments (Narrative) (Details) (USD $) | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  |  | 3 Months Ended | 12 Months Ended |  | 3 Months Ended |  |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  | 0 Months Ended | 3 Months Ended |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  | 3 Months Ended | 12 Months Ended
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Mar. 31, 2014 acre | Mar. 31, 2013 | Dec. 31, 2013 | Mar. 31, 2014 Tatex Thailand II, LLC [Member] | Mar. 31, 2013 Tatex Thailand II, LLC [Member] | Dec. 31, 2013 Tatex Thailand II, LLC [Member] | Mar. 31, 2014 Apico Llc [Member] | Mar. 31, 2014 Tatex Thailand III, LLC [Member] acre | Mar. 31, 2013 Tatex Thailand III, LLC [Member] | Dec. 31, 2013 Tatex Thailand III, LLC [Member] | Mar. 31, 2014 Grizzly Oil Sands ULC [Member] acre | Mar. 31, 2013 Grizzly Oil Sands ULC [Member] | Dec. 31, 2013 Grizzly Oil Sands ULC [Member] | Mar. 31, 2014 Bison Drilling And Field Services LLC [Member] | Mar. 31, 2013 Bison Drilling And Field Services LLC [Member] | Dec. 31, 2013 Bison Drilling And Field Services LLC [Member] | Mar. 31, 2014 Muskie Holdings LLC [Member] | Mar. 31, 2013 Muskie Holdings LLC [Member] | Dec. 31, 2013 Muskie Holdings LLC [Member] | Jul. 02, 2013 Muskie Holdings LLC [Member] | Jul. 02, 2013 Muskie Holdings LLC [Member] Prime Rate [Member] | Mar. 31, 2014 Timber Wolf Terminals LLC [Member] | Mar. 31, 2013 Timber Wolf Terminals LLC [Member] | Dec. 31, 2012 Timber Wolf Terminals LLC [Member] | Dec. 31, 2013 Timber Wolf Terminals LLC [Member] | Mar. 31, 2014 Windsor Midstream LLC [Member] | Mar. 31, 2013 Windsor Midstream LLC [Member] | Dec. 31, 2013 Windsor Midstream LLC [Member] | Mar. 31, 2014 Windsor Midstream LLC [Member] MidMar Gas LLC [Member] | Mar. 31, 2014 Stingray Pressure Pumping LLC [Member] | Mar. 31, 2013 Stingray Pressure Pumping LLC [Member] | Dec. 31, 2013 Stingray Pressure Pumping LLC [Member] | Mar. 31, 2014 Stingray Cementing LLC [Member] | Mar. 31, 2013 Stingray Cementing LLC [Member] | Dec. 31, 2013 Stingray Cementing LLC [Member] | Mar. 31, 2014 Blackhawk Midstream LLC [Member] | Mar. 31, 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] | Mar. 31, 2014 Stingray Logistics LLC [Member] | Mar. 31, 2013 Stingray Logistics LLC [Member] | Dec. 31, 2013 Stingray Logistics LLC [Member] | Nov. 30, 2013 Diamondback Energy, Inc [Member] | Jun. 30, 2013 Diamondback Energy, Inc [Member] | Mar. 31, 2014 Diamondback Energy, Inc [Member] | Mar. 31, 2013 Diamondback Energy, Inc [Member] | Nov. 30, 2013 Diamondback Energy, Inc [Member] | Dec. 31, 2013 Diamondback Energy, Inc [Member] | Dec. 17, 2012 Diamondback Energy, Inc [Member] | May 07, 2012 Diamondback Energy, Inc [Member] | Mar. 31, 2014 Stingray Energy Services LLC [Member] | Mar. 31, 2013 Stingray Energy Services LLC [Member] | Dec. 31, 2013 Stingray Energy Services 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions received | $ 0 | $ 188,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 84,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Income) loss from equity method investments | 128,475,000 | 61,210,000 |  | 0 | 0 |  |  | (49,000) | (18,000) |  | (2,001,000) | (532,000) |  | (1,933,000) | 148,000 |  | (534,000) | (441,000) |  |  |  | 0 | (8,000) |  |  | 168,000 | 384,000 |  |  | (513,000) | 703,000 |  | (95,000) | (22,000) |  | 84,787,000 | (39,000) |  |  | (81,000) | (26,000) |  |  |  | 48,767,000 | 61,096,000 |  |  |  |  | (41,000) | (35,000) |
Cash calls paid |  |  |  |  |  |  |  |  |  |  | 8,100,000 |  |  | 12,200,000 |  |  | 1,000,000 |  |  |  |  |  |  |  |  | 2,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 190,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount put in escrow |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  | 23.50% |  |  |  | 17.90% |  |  | 25.00% |  |  | 40.00% |  |  | 25.00% |  |  |  |  | 50.00% |  |  |  | 22.50% |  |  | 28.40% | 50.00% |  |  | 50.00% |  |  | 50.00% |  |  |  | 50.00% |  |  |  |  | 6.70% |  |  |  |  |  | 50.00% |  |
Equity investments | 499,419,000 |  | 440,068,000 |  |  |  |  | 10,725,000 |  | 10,774,000 | 190,263,000 |  | 191,473,000 | 22,608,000 |  | 12,318,000 | 8,011,000 |  | 7,544,000 |  |  | 1,001,000 |  |  | 1,001,000 | 13,195,000 |  | 10,632,000 |  | 18,872,000 |  | 19,624,000 | 3,067,000 |  | 3,291,000 | 0 |  | 0 |  | 821,000 |  | 903,000 |  |  | 227,474,000 |  |  | 178,708,000 | 138,500,000 |  | 3,382,000 |  | 3,800,000
Sale of Stock, Number of Shares Issued in Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,300,000 | 2,234,536 |  |  |  |  |  |  |  |  |
Sale of Stock, Consideration Received on Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 192,700,000 |  |  |  |  |  |
Increase (decrease) due to foreign currency translation adjustment |  |  |  |  |  |  |  |  |  |  | (7,300,000) | (3,600,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, basis spread on variable rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Income, Interest | 106,000 | 79,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for equity method investments | $ 23,687,000 | $ 12,653,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,900,000
Investment (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,379,500 |  |  |  |  | 7,914,036 |  |  |
Share price (usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 67.31 |  |  |  |  |  |  |  |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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