INCOME TAXES	6 Months Ended
Jun. 30, 2012
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES Income tax expense includes U.S. and international income taxes, determined using an estimate of the Company’s annual effective tax rate. A deferred tax liability is recognized for all taxable temporary differences, and a deferred tax asset is recognized for all deductible temporary differences and operating loss and tax credit carryforwards. A valuation allowance is recognized if it is more likely than not that some portion of the deferred tax asset will not be realized. The Company recognizes income tax expense related to income generated outside of the United States based upon the applicable tax rates and tax laws of the foreign countries in which the income is generated. During the three and six months ended June 30, 2012 and 2011, the substantial majority of the Company’s foreign-sourced income has been generated in the Netherlands and the United Kingdom. Income tax expense for the three and six months ended June 30, 2012 and 2011 differs from the expected tax expense at the U.S. statutory rate of 35%, primarily due to lower foreign tax rates, partially offset by state income taxes and certain non-deductible expenses. Effective January 1, 2010, the Netherlands modified its corporate income tax law related to income generated from qualifying “innovative” activities (“Innovation Box Tax”). Earnings that qualify for the Innovation Box Tax will effectively be taxed at the rate of 5% rather than the Dutch statutory rate of 25%. Booking.com obtained a ruling from the Dutch tax authorities in February 2011 confirming that a portion of its earnings (“qualifying earnings”) is eligible for Innovation Box Tax treatment. The ruling from the Dutch tax authorities is valid from January 1, 2010 through December 31, 2013 (the “Initial Period”). In this ruling, the Dutch tax authorities require that the Innovation Box Tax benefit be phased in over a multi-year period. The benefit is fully phased in starting in 2012. The amount of qualifying earnings expressed as a percentage of the total pretax earnings in the Netherlands will vary depending upon the level of total pretax earnings that is achieved in any given year. In order to be eligible for Innovation Box Tax treatment, Booking.com must, among other things, apply for and obtain a research and development (“R&D”) certificate from a Dutch governmental agency every six months confirming that the activities that Booking.com intends to be engaged in over the subsequent six month period are “innovative.” The R&D certificate is current but should Booking.com fail to secure such a certificate in any future period - for example, because the governmental agency does not view Booking.com’s new or anticipated activities as “innovative” - or should this agency determine that the activities contemplated to be performed in a prior year were not performed as contemplated or did not comply with the agency’s requirements, Booking.com may lose its certificate and, as a result, the Innovation Box Tax benefit may be reduced or eliminated. Booking.com intends to reapply for continued Innovation Box Tax treatment in future periods. There can be no assurance that Booking.com’s application will be accepted, or that the amount of qualifying earnings or applicable tax rates will not be reduced at that time. In addition, there can be no assurance that the tax law will not change in 2012 and/or future years resulting in a reduction or elimination of the tax benefit. The Company currently estimates that its consolidated effective tax rate for 2012 will be lower by approximately four to six percentage points compared to what it would be if the Company did not have the benefit of the Innovation Box Tax. The Innovation Box Tax benefit reduced the Company's consolidated effective tax rate for 2011 by approximately four percentage points. The Company has significant deferred tax assets, resulting principally from domestic net operating loss carryforwards (“NOLs”), after considering the limitation imposed by Section 382 of the Internal Revenue Code ("IRC Section 382"). IRC Section 382 imposes limitations on the availability of a company’s net operating losses after a more than 50 percentage point ownership change occurs. The IRC Section 382 limitation is based upon certain conclusions pertaining to the dates of ownership changes and the value of the Company on the dates of the ownership changes. It was determined that ownership changes, as defined in IRC Section 382, occurred in 2000 and 2002. The amount of the Company’s net operating losses incurred prior to each ownership change is limited based on the value of the Company on the respective dates of ownership change. As of December 31, 2011, it was estimated that the remaining effect of IRC Section 382 will generally limit the total cumulative amount of net operating loss available to offset future taxable income to approximately $1.2 billion. Pursuant to IRC Section 382, future ownership changes might occur that could further limit the $1.2 billion available remaining NOLs. Following an audit by the Internal Revenue Service ("IRS") of the Company's 2009 and 2010 federal income tax returns, the Company reached an agreement with the IRS in June 2012 which covered all tax periods through December 31, 2010. As part of the IRS agreement, certain equity-related tax deductions were disallowed which reduced the cumulative amount of gross NOLs for federal tax purposes at December 31, 2011 from approximately $2.6 billion to approximately $1.6 billion before considering the IRC Section 382 limitation. This reduction in the gross NOLs does not reduce or otherwise affect the amount of net NOLs available to the Company after considering IRC Section 382. Accordingly, since IRC Section 382 limits the Company's available net NOLs to an amount less than $1.6 billion, the agreement with the IRS has no impact on the Company's total deferred tax assets, results of operations, financial position or cash flows. These NOLs mainly expire from December 31, 2019 to December 31, 2021 and their utilization, in addition to being subject to the limitation under IRC Section 382, is dependent on the Company's ability to generate sufficient future taxable income. The $1.6 billion of gross NOLs is comprised of approximately $0.4 billion of NOLs generated from operating losses and approximately $1.2 billion of NOLs generated from equity-related transactions, including equity-based compensation and stock warrants. The Company periodically evaluates the likelihood of the realization of deferred tax assets, and reduces the carrying amount of these deferred tax assets by a valuation allowance to the extent it believes a portion will not be realized. The Company considers many factors when assessing the likelihood of future realization of the deferred tax assets, including its recent cumulative earnings experience by taxing jurisdiction, expectations of future income, the carryforward periods available for tax reporting purposes, and other relevant factors. The deferred tax asset at June 30, 2012 and December 31, 2011 amounted to $64.1 million and $147.8 million, net of the valuation allowance recorded, respectively. The Company has recorded a non-current deferred tax liability in the amount of $45.2 million and $47.0 million at June 30, 2012 and December 31, 2011, respectively, primarily related to the assignment of estimated fair value to certain purchased identifiable intangible assets associated with various international acquisitions. As an international corporation providing hotel reservation services available around the world, the Company is subject to income taxes as well as non-income based taxes, in both the United States and various foreign jurisdictions. Significant judgment is required in determining the Company’s worldwide provision for income taxes and other tax liabilities. Although the Company believes that its tax estimates are reasonable, there is no assurance that the final determination of tax audits or tax disputes will not be different from what is reflected in the Company’s historical income tax provisions and accruals. To date, we have been audited in several taxing jurisdictions with no significant impact on the Company's financial position, results of operations or cash flows.

INCOME TAXES

Income tax expense includes U.S. and international income taxes, determined using an estimate of the Company’s annual effective tax rate. A deferred tax liability is recognized for all taxable temporary differences, and a deferred tax asset is recognized for all deductible temporary differences and operating loss and tax credit carryforwards. A valuation allowance is recognized if it is more likely than not that some portion of the deferred tax asset will not be realized.

The Company recognizes income tax expense related to income generated outside of the United States based upon the applicable tax rates and tax laws of the foreign countries in which the income is generated. During the three and six months ended June 30, 2012 and 2011, the substantial majority of the Company’s foreign-sourced income has been generated in the Netherlands and the United Kingdom. Income tax expense for the three and six months ended June 30, 2012 and 2011 differs from the expected tax expense at the U.S. statutory rate of 35%, primarily due to lower foreign tax rates, partially offset by state income taxes and certain non-deductible expenses.

Effective January 1, 2010, the Netherlands modified its corporate income tax law related to income generated from qualifying “innovative” activities (“Innovation Box Tax”). Earnings that qualify for the Innovation Box Tax will effectively be taxed at the rate of 5% rather than the Dutch statutory rate of 25%. Booking.com obtained a ruling from the Dutch tax authorities in February 2011 confirming that a portion of its earnings (“qualifying earnings”) is eligible for Innovation Box Tax treatment. The ruling from the Dutch tax authorities is valid from January 1, 2010 through December 31, 2013 (the “Initial Period”). In this ruling, the Dutch tax authorities require that the Innovation Box Tax benefit be phased in over a multi-year period. The benefit is fully phased in starting in 2012. The amount of qualifying earnings expressed as a percentage of the total pretax earnings in the Netherlands will vary depending upon the level of total pretax earnings that is achieved in any given year.

In order to be eligible for Innovation Box Tax treatment, Booking.com must, among other things, apply for and obtain a research and development (“R&D”) certificate from a Dutch governmental agency every six months confirming that the activities that Booking.com intends to be engaged in over the subsequent six month period are “innovative.” The R&D certificate is current but should Booking.com fail to secure such a certificate in any future period - for example, because the governmental agency does not view Booking.com’s new or anticipated activities as “innovative” - or should this agency determine that the activities contemplated to be performed in a prior year were not performed as contemplated or did not comply with the agency’s requirements, Booking.com may lose its certificate and, as a result, the Innovation Box Tax benefit may be reduced or eliminated.

Booking.com intends to reapply for continued Innovation Box Tax treatment in future periods. There can be no assurance that Booking.com’s application will be accepted, or that the amount of qualifying earnings or applicable tax rates will not be reduced at that time. In addition, there can be no assurance that the tax law will not change in 2012 and/or future years resulting in a reduction or elimination of the tax benefit.

The Company currently estimates that its consolidated effective tax rate for 2012 will be lower by approximately four to six percentage points compared to what it would be if the Company did not have the benefit of the Innovation Box Tax. The Innovation Box Tax benefit reduced the Company's consolidated effective tax rate for 2011 by approximately four percentage points.

The Company has significant deferred tax assets, resulting principally from domestic net operating loss carryforwards (“NOLs”), after considering the limitation imposed by Section 382 of the Internal Revenue Code ("IRC Section 382"). IRC Section 382 imposes limitations on the availability of a company’s net operating losses after a more than 50 percentage point ownership change occurs. The IRC Section 382 limitation is based upon certain conclusions pertaining to the dates of ownership changes and the value of the Company on the dates of the ownership changes. It was determined that ownership changes, as defined in IRC Section 382, occurred in 2000 and 2002. The amount of the Company’s net operating losses incurred prior to each ownership change is limited based on the value of the Company on the respective dates of ownership change. As of December 31, 2011, it was estimated that the remaining effect of IRC Section 382 will generally limit the total cumulative amount of net operating loss available to offset future taxable income to approximately $1.2 billion. Pursuant to IRC Section 382, future ownership changes might occur that could further limit the $1.2 billion available remaining NOLs.

Following an audit by the Internal Revenue Service ("IRS") of the Company's 2009 and 2010 federal income tax returns, the Company reached an agreement with the IRS in June 2012 which covered all tax periods through December 31, 2010. As part of the IRS agreement, certain equity-related tax deductions were disallowed which reduced the cumulative amount of gross NOLs for federal tax purposes at December 31, 2011 from approximately $2.6 billion to approximately $1.6 billion before considering the IRC Section 382 limitation. This reduction in the gross NOLs does not reduce or otherwise affect the amount of net NOLs available to the Company after considering IRC Section 382. Accordingly, since IRC Section 382 limits the Company's available net NOLs to an amount less than $1.6 billion, the agreement with the IRS has no impact on the Company's total deferred tax assets, results of operations, financial position or cash flows. These NOLs mainly expire from December 31, 2019 to December 31, 2021 and their utilization, in addition to being subject to the limitation under IRC Section 382, is dependent on the Company's ability to generate sufficient future taxable income.

The $1.6 billion of gross NOLs is comprised of approximately $0.4 billion of NOLs generated from operating losses and approximately $1.2 billion of NOLs generated from equity-related transactions, including equity-based compensation and stock warrants.

The Company periodically evaluates the likelihood of the realization of deferred tax assets, and reduces the carrying amount of these deferred tax assets by a valuation allowance to the extent it believes a portion will not be realized. The Company considers many factors when assessing the likelihood of future realization of the deferred tax assets, including its recent cumulative earnings experience by taxing jurisdiction, expectations of future income, the carryforward periods available for tax reporting purposes, and other relevant factors. The deferred tax asset at June 30, 2012 and December 31, 2011 amounted to $64.1 million and $147.8 million, net of the valuation allowance recorded, respectively.

The Company has recorded a non-current deferred tax liability in the amount of $45.2 million and $47.0 million at June 30, 2012 and December 31, 2011, respectively, primarily related to the assignment of estimated fair value to certain purchased identifiable intangible assets associated with various international acquisitions.

As an international corporation providing hotel reservation services available around the world, the Company is subject to income taxes as well as non-income based taxes, in both the United States and various foreign jurisdictions. Significant judgment is required in determining the Company’s worldwide provision for income taxes and other tax liabilities. Although the Company believes that its tax estimates are reasonable, there is no assurance that the final determination of tax audits or tax disputes will not be different from what is reflected in the Company’s historical income tax provisions and accruals. To date, we have been audited in several taxing jurisdictions with no significant impact on the Company's financial position, results of operations or cash flows.