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Shareholders' Equity - Summary of Share Count and Par Value Data Related to Shareholders' Equity (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Preferred Stock      
Preferred stock, par value per share $ 0us-gaap_PreferredStockNoParValue $ 0us-gaap_PreferredStockNoParValue  
Preferred stock, shares authorized 25,000,000us-gaap_PreferredStockSharesAuthorized 25,000,000us-gaap_PreferredStockSharesAuthorized  
Common Stock      
Common stock, par value per share $ 0us-gaap_CommonStockNoParValue $ 0us-gaap_CommonStockNoParValue  
Common stock, shares authorized 75,000,000us-gaap_CommonStockSharesAuthorized 75,000,000us-gaap_CommonStockSharesAuthorized  
Common stock, shares issued 56,101,700us-gaap_CommonStockSharesIssued 55,808,008us-gaap_CommonStockSharesIssued  
Common stock, shares outstanding 33,392,060us-gaap_CommonStockSharesOutstanding 33,558,864us-gaap_CommonStockSharesOutstanding 33,433,128us-gaap_CommonStockSharesOutstanding
Treasury stock      
Treasury stock, shares held 22,709,640us-gaap_TreasuryStockShares 22,249,144us-gaap_TreasuryStockShares