Shareholder's Equity (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014
Equity [Abstract]
Amount of outstanding common stock available to be repurchased	$ 15.0
Total remaining authorization under the repurchase program	$ 14.7

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