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Gain on sale of assets (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	3 Months Ended		6 Months Ended
	Jun. 14, 2013	Jun. 30, 2013	Jun. 30, 2012 Property	Jun. 30, 2013	Jun. 30, 2012
Gain on sale of assets [Abstract]
Gain (Loss) on Disposition of Property		$ 0	$ 2,122	$ 0	$ 2,122
Proceeds from Sale of Property, Plant, and Equipment	$ 12,500		$ 8,791	$ 0	$ 8,791
Properties Sold			3

The gains (losses) included in results of operations resulting from the sale or disposal of property, plant and equipment, which do not qualify for treatment as discontinued operations. This item does not include any gain (loss) recognized on the sale of oil and gas property or timber property.

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- Definition

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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