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Condensed Consolidated 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 $ 5,556us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 4,164us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Preferred stock, par value $ 0us-gaap_PreferredStockNoParValue $ 0us-gaap_PreferredStockNoParValue
Preferred stock, shares authorized 20,000,000us-gaap_PreferredStockSharesAuthorized 20,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common stock, par value $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 200,000,000us-gaap_CommonStockSharesAuthorized 200,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 73,799,618us-gaap_CommonStockSharesIssued 74,104,064us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 73,799,618us-gaap_CommonStockSharesOutstanding 74,104,064us-gaap_CommonStockSharesOutstanding