Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

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Derivatives Derivatives by Balance Sheet Location (Details) (USD $)	Dec. 31, 2014	Nov. 01, 2014	Dec. 31, 2013
Notional Disclosures [Abstract]
Derivative, Nonmonetary Notional Amount	215.9	10,600.0
Commodity Contract [Member] \| Cash Flow Hedging [Member] \| Assets, Total [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 192,332		$ 83,661
Derivative Liability, Fair Value, Gross Liability			18,212
Commodity Contract [Member] \| Cash Flow Hedging [Member] \| Prepaid Expenses [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets, Current	123,676	1,064	59,605
Derivative Liabilities, Current		327
Commodity Contract [Member] \| Cash Flow Hedging [Member] \| Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets, Noncurrent	68,656		24,056
Commodity Contract [Member] \| Cash Flow Hedging [Member] \| Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Current			12,327
Commodity Contract [Member] \| Cash Flow Hedging [Member] \| Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Noncurrent			$ 5,885