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Consolidated Condensed Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Statement Of Financial Position [Abstract]    
Accounts receivable, allowance $ 2,858us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 2,847us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Common Stock, par value      
Common Stock, shares authorized 55,000,000us-gaap_CommonStockSharesAuthorized 55,000,000us-gaap_CommonStockSharesAuthorized
Common Stock, shares issued 35,890,326us-gaap_CommonStockSharesIssued 35,696,334us-gaap_CommonStockSharesIssued
Common Stock, shares outstanding 35,890,326us-gaap_CommonStockSharesOutstanding 35,696,334us-gaap_CommonStockSharesOutstanding