Stock Repurchase Program And Shares Withheld From Vested Restricted Shares - Narrative (Details) (USD $)	0 Months Ended
Aug. 21, 2013	Nov. 30, 2011
Equity [Abstract]
Share repurchase program, authorized amount		$ 50,000,000
Share repurchase program, additional amount authorized	$ 50,000,000

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