Subsequent Event (Details) (Subsequent event, Asset Purchase Agreement, J.T. Power, USD $) In Millions, unless otherwise specified	0 Months Ended
	Nov. 06, 2013
Subsequent events
Value of certain assets purchased	$ 5.9
Net cash payment for certain asset purchases	4.5
Cash payment to creditors for certain asset purchases	1.2
Cash payment to shareholders for certain asset purchases	3.3
Consignment agreement with guarantee
Subsequent events
Amount owed to the entity related to the minimum guarantee, which is deducted from payment made in cash	$ 1.1