Aggregate amount of interest paid or due on all long-term debt.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 8

-Article 9

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.8)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Name:	us-gaap_InterestExpenseLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Term Loan (Details) (Term Loan, USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended		9 Months Ended
	May 31, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Term Loan
Term Loan
Repayment of principal amount	$ 8.8
Amount of interest, prepayment and final payment fees	0.7
Interest expense on the term loan		$ 0	$ 0.4	$ 0.8	$ 1.2