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Equity Investments (Narrative) (Details) (USD $) | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended |  | 6 Months Ended | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended |  | 0 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |  |  | 3 Months Ended | 6 Months Ended |  |  | 3 Months Ended |  |  | 3 Months Ended | 6 Months Ended |  |  | 3 Months Ended | 6 Months Ended |  | 6 Months Ended |  |  | 3 Months Ended | 6 Months Ended |  | 6 Months Ended |  | 0 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |  | 3 Months Ended | 6 Months Ended |  | 0 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 acre | Jun. 30, 2012 | Dec. 31, 2012 | Jun. 30, 2013 Tatex Thailand II, LLC [Member] | Jun. 30, 2013 Tatex Thailand II, LLC [Member] | Dec. 31, 2012 Tatex Thailand II, LLC [Member] | Jun. 30, 2013 Apico Llc [Member] | Jun. 30, 2013 Tatex Thailand III, LLC [Member] | Jun. 30, 2013 Tatex Thailand III, LLC [Member] | Jun. 30, 2012 Tatex Thailand III, LLC [Member] | Dec. 31, 2012 Tatex Thailand III, LLC [Member] | Jun. 30, 2013 Grizzly Oil Sands ULC [Member] | Jun. 30, 2012 Grizzly Oil Sands ULC [Member] | Jun. 30, 2013 Grizzly Oil Sands ULC [Member] acre | Jun. 30, 2012 Grizzly Oil Sands ULC [Member] | Dec. 31, 2012 Grizzly Oil Sands ULC [Member] | May 15, 2012 Bison Drilling And Field Services LLC [Member] | Apr. 30, 2012 Bison Drilling And Field Services LLC [Member] | Jun. 30, 2013 Bison Drilling And Field Services LLC [Member] | Jun. 30, 2012 Bison Drilling And Field Services LLC [Member] | Jun. 30, 2013 Bison Drilling And Field Services LLC [Member] | Jun. 30, 2012 Bison Drilling And Field Services LLC [Member] | Sep. 30, 2012 Bison Drilling And Field Services LLC [Member] | Dec. 31, 2012 Bison Drilling And Field Services LLC [Member] | Sep. 30, 2011 Bison Drilling And Field Services LLC [Member] | May 15, 2012 Bison Drilling And Field Services LLC [Member] Minimum [Member] | May 15, 2012 Bison Drilling And Field Services LLC [Member] Maximum [Member] | Jun. 30, 2013 Muskie Holdings LLC [Member] | Jun. 30, 2012 Muskie Holdings LLC [Member] | Jun. 30, 2013 Muskie Holdings LLC [Member] | Jun. 30, 2012 Muskie Holdings LLC [Member] | Dec. 31, 2012 Muskie Holdings LLC [Member] | Dec. 31, 2011 Muskie Holdings LLC [Member] | Jun. 30, 2012 Timber Wolf Terminals LLC [Member] | Jun. 30, 2013 Timber Wolf Terminals LLC [Member] | Dec. 31, 2012 Timber Wolf Terminals LLC [Member] | Jun. 30, 2013 Windsor Midstream LLC [Member] | Jun. 30, 2012 Windsor Midstream LLC [Member] | Mar. 31, 2012 Windsor Midstream LLC [Member] | Jun. 30, 2013 Windsor Midstream LLC [Member] | Jun. 30, 2012 Windsor Midstream LLC [Member] | Dec. 31, 2012 Windsor Midstream LLC [Member] | Jun. 30, 2013 Windsor Midstream LLC [Member] MidMar Gas LLC [Member] | Jun. 30, 2013 Stingray Pressure Pumping LLC [Member] | Jun. 30, 2012 Stingray Pressure Pumping LLC [Member] | Jun. 30, 2013 Stingray Pressure Pumping LLC [Member] | Jun. 30, 2012 Stingray Pressure Pumping LLC [Member] | Dec. 31, 2012 Stingray Pressure Pumping LLC [Member] | Jun. 30, 2013 Stingray Cementing LLC [Member] | Dec. 31, 2012 Stingray Cementing LLC [Member] | Jun. 30, 2012 Stingray Cementing LLC [Member] | Jun. 30, 2013 Blackhawk Midstream LLC [Member] | Jun. 30, 2012 Blackhawk Midstream LLC [Member] | Jun. 30, 2013 Blackhawk Midstream LLC [Member] | Jun. 30, 2012 Blackhawk Midstream LLC [Member] | Dec. 31, 2012 Blackhawk Midstream LLC [Member] | Jun. 30, 2013 Stingray Logistics LLC [Member] | Dec. 31, 2012 Stingray Logistics LLC [Member] | Jun. 24, 2013 Diamondback Energy LLC [Member] | Jun. 30, 2013 Diamondback Energy LLC [Member] | Jun. 30, 2013 Diamondback Energy LLC [Member] | Dec. 31, 2012 Diamondback Energy LLC [Member] | Dec. 17, 2012 Diamondback Energy LLC [Member] | Oct. 11, 2012 Diamondback Energy LLC [Member] | Jun. 30, 2012 Diamondback Energy LLC [Member] | Jun. 30, 2013 Stingray Energy Services LLC [Member] | Mar. 31, 2013 Stingray Energy Services LLC [Member] | Jun. 30, 2013 Stingray Energy Services LLC [Member] | Dec. 31, 2012 Stingray Energy Services LLC [Member] | Jul. 05, 2013 Subsequent Event [Member] Diamondback Energy LLC [Member]
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  |  | 23.50% | 23.50% |  |  | 17.90% | 17.90% |  |  | 24.9999% |  | 24.9999% |  |  |  |  | 40.00% |  | 40.00% |  |  |  | 25.00% |  |  |  |  |  |  |  | 25.00% |  | 50.00% |  | 22.50% |  |  | 22.50% |  |  | 28.40% |  | 50.00% |  | 50.00% |  |  |  | 50.00% |  | 50.00% |  | 50.00% |  |  | 50.00% |  | 13.50% | 13.50% |  |  |  | 21.40% | 50.00% |  | 50.00% |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  | 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions received |  |  | $ 901,000 | $ 200,000 |  | $ 200,000 | $ 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 698,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, percentage of remaining interest |  |  |  |  |  |  |  |  |  |  | 68.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investments | 438,864,000 |  | 438,864,000 |  | 381,484,000 |  |  | 203,000 |  | 9,138,000 | 9,138,000 |  | 8,657,000 | 176,876,000 |  | 176,876,000 |  | 172,766,000 |  |  | 13,816,000 |  | 13,816,000 |  |  | 13,518,000 |  |  |  | 8,453,000 |  | 8,453,000 |  | 7,320,000 |  |  | 870,000 | 878,000 | 9,664,000 |  |  | 9,664,000 |  | 9,503,000 |  | 15,399,000 |  | 15,399,000 |  | 13,265,000 | 3,041,000 | 3,110,000 |  | 0 |  | 0 |  | 0 | 900,000 | 947,000 |  | 198,662,000 | 198,662,000 | 151,317,000 | 138,500,000 |  |  | 2,045,000 |  | 2,045,000 | 0 |
Sale of Stock, Price Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 34.75 |  |  |  |  |  |  |  |  |  |  |
(Income) loss from equity method investments | 50,108,000 | (360,000) | 111,318,000 | (628,000) |  | 200,000 | 200,000 |  |  | 100,000 | 100,000 | 100,000 |  | (800,000) | (300,000) | (1,300,000) | (600,000) |  |  |  | 200,000 | 300,000 |  | 300,000 |  |  |  |  |  | (400,000) | (100,000) | (800,000) | (100,000) |  |  |  |  |  | 474,000 | 59,000 |  | 858,000 | 115,000 |  |  | 319,000 | 100,000 | (400,000) | 100,000 |  | 69,000.00 |  |  | 100,000 | 200,000 | 100,000 | 200,000 |  | 100,000 |  |  | 51,400,000 | 112,500,000 |  |  |  |  | 103,000 |  | 138,000 |  |
Cash calls paid |  |  |  |  |  |  |  |  |  |  | 600,000 |  |  |  |  | 15,100,000 |  |  |  |  |  |  | 300,000 |  |  |  |  |  |  |  |  | 1,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,800,000 |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) due to foreign currency translation adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  | (6,100,000) | (2,900,000) | (9,700,000) | (1,900,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,951,781 |  |  |  |  |  |  |  |  |  |  | 282,755
Net sales proceeds |  |  | (65,111,000) | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 65,100,000 |  |  |  |  |  |  |  |  |  |  | 9,400,000
Loans receivable, description of variable rate basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, basis spread on variable rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.28% | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for equity method investments |  |  | 21,960,000 | 101,864,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  | 7,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,200,000 |  |  |
Amount loaned during period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,914,036 |  |  |  |  |  |
Promissory note receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 63,600,000 |  |  |  |  |  |
Share price (usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 33.32 | $ 33.32 |  |  |  |  |  |  |  |  |

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- Definition Balance held at close of period in number of shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12C -Paragraph Column B -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column B -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 14 -Paragraph Column B -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14.Column B) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611322-123010 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12.Column B) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611133-123010 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-12C.Column B) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611225-123010 + Details
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- Definition The percentage points (also referred to as 'margin') added to the reference rate as stated in the loan agreement and used to compute the variable rate on the loans receivable. For instance, the loan agreement might state that the interest rate the borrower is obligated to pay is the London Interbank Offered Rate (LIBOR) plus three quarters (3/4) of a percentage point adjusted quarterly (each three months). LIBOR in this example is the index or reference rate, 3/4 percentage point is the margin, the reference rate plus the margin is the fully indexed rate. This element would be used to report separately the margin. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the loans receivable, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition An amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money within one year from the balance sheet date (or the normal operating cycle, whichever is longer), net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section A -Paragraph 4 -Chapter 3 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4531-111522 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6676-107765 + 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=6943989&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section H + 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=7578670&loc=d3e19207-110258 + Details
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