Basis of Presentation (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013
Basis of Presentation (Textual)
Change in accounting estimate, description		Effective February 1, 2013, the Group changed the time period over which it depreciates machinery and equipment to 20 years from 15 years.
Change in estimate resulted in reduction of depreciation expense	$ 0.7	$ 1.7