2.2.0.25falsefalse002010 - Statement - CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical)truefalseIn Thousandsfalse1falsefalseUSDfalsefalse3/31/2011 USD ($) $c00020http://www.sec.gov/CIK0000741508instant2011-03-31T00:00:000001-01-01T00:00:00u000Standardhttp://www.xbrl.org/2003/iso4217USDiso42170u001Standardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2falsefalseUSDfalsefalse12/31/2010 USD ($) $c00015http://www.sec.gov/CIK0000741508instant2010-12-31T00:00:000001-01-01T00:00:00u000Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3true0us-gaap_AssetsCurrentAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseCurrent Assets:4false0us-gaap_AllowanceForDoubtfulAccountsReceivableCurrentus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse2826400028264falsetruefalsefalsefalse2truefalsefalse2868400028684falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryA valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 falsefalseAccounts receivable less allowance for uncollectible accounts: 2011-$28,264; 2010-$28,68422CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) (USD $)ThousandsUnKnownUnKnownUnKnownfalsetrue