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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Statement Of Financial Position [Abstract]    
Accounts receivable, reserves (in dollars) $ 2,017us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 2,625us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Preferred shares, no par value $ 0us-gaap_PreferredStockNoParValue $ 0us-gaap_PreferredStockNoParValue
Preferred shares, authorized 5,000,000us-gaap_PreferredStockSharesAuthorized 5,000,000us-gaap_PreferredStockSharesAuthorized
Preferred shares, issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Common shares, no par value $ 0us-gaap_CommonStockNoParValue $ 0us-gaap_CommonStockNoParValue
Common shares, authorized 60,000,000us-gaap_CommonStockSharesAuthorized 60,000,000us-gaap_CommonStockSharesAuthorized
Common shares, issued 28,853,000us-gaap_CommonStockSharesIssued 28,803,000us-gaap_CommonStockSharesIssued
Common shares, outstanding 28,221,000us-gaap_CommonStockSharesOutstanding 28,483,000us-gaap_CommonStockSharesOutstanding
Common shares held in treasury, shares 632,000us-gaap_TreasuryStockShares 320,000us-gaap_TreasuryStockShares