Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Condensed Consolidated Balance Sheets
Accounts receivable, allowance for doubtful accounts (in dollars)	$ 1,210	$ 1,312
Common shares, par value (in dollars per share)	$ 0us-gaap_CommonStockNoParValue	$ 0us-gaap_CommonStockNoParValue
Common shares, shares authorized	39,158,666us-gaap_CommonStockSharesAuthorized	39,158,666us-gaap_CommonStockSharesAuthorized
Common shares, shares issued	38,434,136us-gaap_CommonStockSharesIssued	38,425,886us-gaap_CommonStockSharesIssued
Common shares, shares outstanding	38,344,608us-gaap_CommonStockSharesOutstanding	38,336,358us-gaap_CommonStockSharesOutstanding
Treasury Stock, Shares	89,528us-gaap_TreasuryStockShares	89,528us-gaap_TreasuryStockShares

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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