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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current assets:    
Allowance for uncollectible accounts $ 19,846us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 17,702us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Liabilities and Equity [Abstract]    
Preferred stock, par value $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized 11,000,000us-gaap_PreferredStockSharesAuthorized 11,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Stockholders' Equity Attributable to Parent [Abstract]    
Common stock, par value $ 0.001us-gaap_CommonStockParOrStatedValuePerShare $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 175,000,000us-gaap_CommonStockSharesAuthorized 175,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares outstanding 82,937,000us-gaap_CommonStockSharesOutstanding 88,508,000us-gaap_CommonStockSharesOutstanding