Summary of Significant Accounting Policies (Details 9) (North American Business, Leased vehicles, USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013
North American Business | Leased vehicles
Property, plant and equipment and long-lived assets
Gain (loss) on disposal/write-down of property, plant and equipment	$ 1,663	$ 2,202