Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 2,038	$ 2,007
Common stock, par value	$ 0us-gaap_CommonStockNoParValue	$ 0us-gaap_CommonStockNoParValue
Common stock, shares authorized	40,000us-gaap_CommonStockSharesAuthorized	40,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	26,051us-gaap_CommonStockSharesIssued	25,757us-gaap_CommonStockSharesIssued
Common Stock, shares outstanding	26,051us-gaap_CommonStockSharesOutstanding	25,757us-gaap_CommonStockSharesOutstanding

For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

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