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Fixed Assets and Asset Retirement Obligations (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Fixed Assets And Asset Retirement Obligations [Abstract] |  |  |
Depreciation expense | $ 73.2 | $ 46.3 | $ 37.4

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- Definition Fixed Assets And Asset Retirement Obligations [Abstract] + References No definition available. + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + 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 + Details
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