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Subsequent Event (Details) (USD $) In Millions, unless otherwise specified				1 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Jul. 31, 2012 Anchorage, AK [Member] Scenario Forecast [Member]	Jun. 30, 2012 Anchorage, AK [Member] Scenario Forecast [Member]
Subsequent Event [Line Items]
Property, plant and equipment facility sold				$ 3.4
Gain on sale of property, plant and equipment facility				2.2
Cost of property, plant and equipment, net	$ 16.7	$ 17.2	$ 18.1		$ 0.9
Subsequent event, description				Net proceeds from the sale were used to pay down debt in July 2012.

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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- Definition

Describes the event or transaction that occurred between the balance sheet date and the date the financial statements are issued or available to be issued.

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