Borrowings Term loan (Details) (Term loan, USD $) In Millions, unless otherwise specified	0 Months Ended	9 Months Ended			1 Months Ended	9 Months Ended
	Apr. 04, 2012	Sep. 30, 2012 installments	Dec. 13, 2010	Nov. 30, 2010	Dec. 31, 2010 Previous Term Loan	Sep. 30, 2012 Minimum
Debt Instrument [Line Items]
Face amount			$ 5.0	$ 2.0
Early Repayment of Senior Debt	3.3
Debt Instrument, Maximum Borrowing Capacity			5.0
Long-term Debt			5.0
Debt Instrument, Proceeds From Borrowings Used To Pay Off A Previous Term Loan					$ 1.0
Debt Instruments, Number Of Interest Only Payments		6
Debt Instrument, Number Of Equal Monthly Instruments Of Principal Plus Interest		30
Variable rate basis		bank’s prime rate				30-day LIBOR rate
Basis spread on variable rate		1.50%				2.50%
Debt Instrument, Loan Covenants, Minimum Quick Ratio		1.10