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Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Additional Information (Details) (USD $) | 12 Months Ended
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Dec. 31, 2012 contracts | Dec. 31, 2011 | Dec. 31, 2010
Significant Accounting Policies [Line Items] |  |  |
Inventory provision for obsolescence | $ 300,000 | $ 200,000 |
Capitalized internal costs | 61,300,000 | 37,100,000 | 28,600,000
Liquidated restricted deposits | 0 | 0 | 5,095,000
Restricted deposits | 27,947,000 | 27,912,000 |
Restricted deposit - pending sale | 255,000,000 | 0 |
Natural gas balancing liability | 3,600,000 | 1,700,000 |
Construction contracts using completed-contract method (in number of contracts) | 2 |  |
Advertising expense | 11,800,000 | 4,800,000 | 5,400,000
Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Maximum reserves sold from cost center not expected to result in significant alteration | 25.00% |  |
Cholla Pipeline, L.P. |  |  |
Significant Accounting Policies [Line Items] |  |  |
Noncontrolling interest ownership percentage | 1.29% | 1.29% | 1.29%
Buildings | Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment, useful life | 39 years |  |
Buildings | Minimum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment, useful life | 10 years |  |
Equipment | Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment, useful life | 30 years |  |
Equipment | Minimum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment, useful life | 3 years |  |
Oil And Gas Unproved Properties |  |  |
Significant Accounting Policies [Line Items] |  |  |
Interest capitalized during period | 10,100,000 | 1,000,000 | 300,000
Midstream And Corporate Assets |  |  |
Significant Accounting Policies [Line Items] |  |  |
Interest capitalized during period | $ 4,700,000 | $ 2,000,000 | $ 1,000,000

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 93-7 -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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