Segment Information (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Major customers percentage of total revenues, minimum	10.00%
Property, plant and equipment, net	$ 774,406	$ 701,235
Percentage of total net book value of property plant and equipment	98.00%	98.00%
United States [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment, net	597,900	519,400
Ireland [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment, net	109,000	112,200
Canada [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 51,700	$ 53,900

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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