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Stock Repurchase Program (Details) (USD $) In Millions, unless otherwise specified | 0 Months Ended
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Feb. 16, 2012
Stock Repurchase Program |
Repurchase of common stock authorized by board of directors | $ 100.0

X
- Details
Name: | us-gaap_StockholdersEquityNoteAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount authorized by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramAuthorizedAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration