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Fair Value Measurements Derivatives Not Designated as Hedging (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Fuel oil or natural gas hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, number of fuel oil or natural gas hedges outstanding	0	0
Other Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Commodity swap agreements	$ 0	$ 0	$ 1,286

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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