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Consolidated Statements of Financial Position (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Statement of Financial Position [Abstract]    
Allowances for accounts receivable $ 782us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 1,313us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Preferred Shares, shares authorized (in shares) 1,000,000us-gaap_PreferredStockSharesAuthorized 1,000,000us-gaap_PreferredStockSharesAuthorized
Preferred Shares, shares issued (in shares) 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred Shares, shares outstanding (in shares) 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common Shares, shares authorized (in shares) 60,000,000us-gaap_CommonStockSharesAuthorized 60,000,000us-gaap_CommonStockSharesAuthorized
Common Shares, shares outstanding (in shares) 31,162,962us-gaap_CommonStockSharesOutstanding 33,572,778us-gaap_CommonStockSharesOutstanding
Common shares, treasury (in shares) 6,604,175us-gaap_TreasuryStockShares 4,203,179us-gaap_TreasuryStockShares