Repurchases Of Common Stock (Narrative) (Details) (USD $)	6 Months Ended
Jun. 30, 2013
Class of Stock Disclosures [Abstract]
Additional board authorization	$ 250,000,000

The amount authorized by an entity's Board of Directors under a stock repurchase plan.

No definition available.

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