Balance Sheet Parenthetical (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Restricted investments	430us-gaap_RestrictedInvestments	430us-gaap_RestrictedInvestments
Allowances for accounts receivable	35	35
Accumulated depreciation and amortization, property and equipment	35,899	36,274
Preferred stock, par value per share	0.01	0.01
Preferred stock, shares authorized	5,000us-gaap_PreferredStockSharesAuthorized	5,000us-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 per share	0.001	0.001
Common stock, shares authorized	900,000us-gaap_CommonStockSharesAuthorized	900,000us-gaap_CommonStockSharesAuthorized
Treasury stock, shares	1,662us-gaap_TreasuryStockShares	1,281us-gaap_TreasuryStockShares
Common Stock
Common stock, shares issued	726,807	725,641

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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