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Property, Plant and Equipment 2 Parentheticals (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Computer software [Abstract]
Unamortized computer software cost	$ 140,397	$ 131,182
Less accumulated amortization	89,258	79,637
Net capitalized computer software costs	$ 51,139	$ 51,545
Property, Plant and Equipment [Abstract]
Weighted average depreciation rate	3.40%	3.50%	3.50%

For each balance sheet presented, the amount of accumulated amortization for capitalized computer software costs.

The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date.