2.2.0.25falsefalse2109100 - Disclosure - Treasury stocktruefalsefalse1falsefalseUSDfalsefalse1/1/2011 - 3/31/2011 USD ($) USD ($) / shares $D2011Q2http://www.sec.gov/CIK0001096752duration2011-01-01T00:00:002011-03-31T00:00:00usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170usdPerShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2true0us-gaap_TreasuryStockNoteDisclosureAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseTreasury Stock Note Disclosure [Abstract]3false0us-gaap_ScheduleOfTreasuryStockByClassTextBlockus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-left:24px;text-align:left;text-indent:-24px;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;font-weight:bold;">Treasury stock</font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;">The Company purchased 1 million shares of its common stock and a small number of shares related to the net settlement of certain stock awards for tax withholding purposes, during the quarter ended </font><font style="font-family:Arial;font-size:10pt;color:#000000;text-decoration:none;">March&#160;31, 2011</font><font style="font-family:Arial;font-size:10pt;"> under its July 2006 authorization from the Board. This authorization permits the Company to acquire up to 10 million shares of its common stock, of which approximately 3 million have been repurchased to date. Future purchases may be made from time to time on the open market or through privately negotiated transactions, subject to corporate objectives and the discretion of management.</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"></font></div></div>Treasury stockThe Company purchased 1 million shares of its common stock and a small number of shares related to the net settlement of certain stock awards forfalsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringThis element may be used to capture the complete disclosure pertaining to an entity's treasury stock, including the average cost per share, carrying basis for each class of treasury stock, description of share repurchase program authorized by an entity's Board of Directors, the treatment of the purchase price in excess of the current market value, number of shares held for each class of treasury stock, and other information necessary to a fair presentation.No authoritative reference available.falsefalseSchedule of Treasury Stock by Class [Text Block]12Treasury stockUnKnownUnKnownUnKnownUnKnownfalsetrue