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Stock Repurchase Program (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Jun. 30, 2010
Dec. 31, 2008
Jan. 25, 2008
Stock Repurchase Program [Abstract]      
Shares authorized for repurchase (in shares)     1,000,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Total number of shares purchased (in shares) 223,051us-gaap_TreasuryStockSharesAcquired 491,572us-gaap_TreasuryStockSharesAcquired  
Payments for shares purchased $ 5.2us-gaap_PaymentsForRepurchaseOfCommonStock $ 11.5us-gaap_PaymentsForRepurchaseOfCommonStock