Subsequent Events (Details) (Common Stock, USD $) In Millions, unless otherwise specified	0 Months Ended	12 Months Ended
Mar. 15, 2012	Sep. 12, 2013 Subsequent Event	Aug. 27, 2013 Subsequent Event	Jul. 27, 2013 Subsequent Event
Subsequent Event [Line Items]
Common stock authorized repurchase amount	$ 40.0	$ 40.0	$ 40.0
Remaining authorized repurchase amount				$ 22.8

Amount remaining of a stock repurchase plan authorized by an entity's Board of Directors.

No definition available.

Name:	us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration