Summary of Significant Accounting Policies (Details 9) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 North American Business Leased vehicles	Mar. 31, 2012 International Business
Property, plant and equipment and long-lived assets
Gain (loss) on disposal/write-down of property, plant and equipment	$ 539	$ (719)