Contingencies (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Loss Contingencies [Line Items]
Contingency liability	$ 2,719	$ 2,719
Contingency expense	0	2,719	0
Cost of Sales
Loss Contingencies [Line Items]
Contingency expense		1,800
Selling, General and Administrative Expenses
Loss Contingencies [Line Items]
Contingency expense		$ 900