Income Taxes	12 Months Ended
Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes We are subject to corporate income taxes in countries where we have operations or subsidiaries. We and the majority of our ship-operating and vessel-owning subsidiaries are currently exempt from U.S. corporate tax on U.S. source income from the international operation of ships pursuant to Section 883 of the Internal Revenue Code. Regulations under Section 883 have limited the activities that are considered the international operation of a ship or incidental thereto. Accordingly, our provision for U.S. federal and state income taxes includes taxes on certain activities not considered incidental to the international operation of our ships. Additionally, some of our ship-operating subsidiaries are subject to income tax under the tonnage tax regimes of Malta or the United Kingdom. Under these regimes, income from qualifying activities is subject to corporate income tax, but the tax is computed by reference to the tonnage of the ship or ships registered under the relevant provisions of the tax regimes (the "relevant shipping profits"), which replaces the regular taxable income base. Income from activities not considered qualifying activities, which we do not consider significant, remains subject to Maltese or U.K. corporate income tax. Income tax expense for items not qualifying under Section 883, tonnage taxes and income taxes for the remainder of our subsidiaries was approximately $18.3 million, $20.1 million and $11.1 million and was recorded within Other expense for the years ended December 31, 2017, 2016 and 2015, respectively. In addition, all interest expense and penalties related to income tax liabilities are classified as income tax expense within Other expense. For a majority of our subsidiaries, we do not expect to incur income taxes on future distributions of undistributed earnings of foreign subsidiaries. Accordingly, no deferred income taxes have been provided for the distribution of these earnings. Where we do expect to incur income taxes on future distributions of undistributed earnings, we have provided for deferred taxes, which we do not consider significant to our operations. As of December 31, 2017, the Company had Net Operating Losses (“NOLs”) in foreign jurisdictions of $7.5 million. If not utilized, $5.0 million of the NOLs are subject to expiration between 2018 and 2024. The Company has not recognized any benefits related to these NOLs, as all NOLs have full valuation allowances. Net deferred tax assets and deferred tax liabilities and corresponding valuation allowances related to our operations were not material as of December 31, 2017 and 2016. We regularly review deferred tax assets for recoverability based on our history of earnings, expectations of future earnings, and tax planning strategies. Realization of deferred tax assets ultimately depends on the existence of sufficient taxable income to support the amount of deferred taxes. A valuation allowance is recorded in those circumstances in which we conclude it is not more-likely-than-not we will recover the deferred tax assets prior to their expiration. During the third quarter of 2015, the Pullmantur trademark and trade names were impaired. As a result of the impairment, there was no longer a difference between the book and tax basis of the trademark and trade names. During the third quarter of 2015, we reversed the deferred tax liability of $43.4 million and increased the deferred tax asset valuation allowance by $31.4 million, or to 100% of the deferred tax asset balance. The resulting net $12.0 million deferred tax benefit was recorded as part of our income tax provision and was reported within Other expense in our consolidated statements of comprehensive income (loss) for the year ended December 31, 2015. Effective July 31, 2016, we sold 51% of our interest in Pullmantur Holdings. For further information on the sale transaction, refer to Note 1. General.

Income Taxes

We are subject to corporate income taxes in countries where we have operations or subsidiaries. We and the majority of our ship-operating and vessel-owning subsidiaries are currently exempt from U.S. corporate tax on U.S. source income from the international operation of ships pursuant to Section 883 of the Internal Revenue Code. Regulations under Section 883 have limited the activities that are considered the international operation of a ship or incidental thereto. Accordingly, our provision for U.S. federal and state income taxes includes taxes on certain activities not considered incidental to the international operation of our ships.

Additionally, some of our ship-operating subsidiaries are subject to income tax under the tonnage tax regimes of Malta or the United Kingdom. Under these regimes, income from qualifying activities is subject to corporate income tax, but the tax is computed by reference to the tonnage of the ship or ships registered under the relevant provisions of the tax regimes (the "relevant shipping profits"), which replaces the regular taxable income base. Income from activities not considered qualifying activities, which we do not consider significant, remains subject to Maltese or U.K. corporate income tax.

Income tax expense for items not qualifying under Section 883, tonnage taxes and income taxes for the remainder of our subsidiaries was approximately $18.3 million, $20.1 million and $11.1 million and was recorded within Other expense for the years ended December 31, 2017, 2016 and 2015, respectively. In addition, all interest expense and penalties related to income tax liabilities are classified as income tax expense within Other expense.

For a majority of our subsidiaries, we do not expect to incur income taxes on future distributions of undistributed earnings of foreign subsidiaries. Accordingly, no deferred income taxes have been provided for the distribution of these earnings. Where we do expect to incur income taxes on future distributions of undistributed earnings, we have provided for deferred taxes, which we do not consider significant to our operations.

As of December 31, 2017, the Company had Net Operating Losses (“NOLs”) in foreign jurisdictions of $7.5 million. If not utilized, $5.0 million of the NOLs are subject to expiration between 2018 and 2024. The Company has not recognized any benefits related to these NOLs, as all NOLs have full valuation allowances.

Net deferred tax assets and deferred tax liabilities and corresponding valuation allowances related to our operations were not material as of December 31, 2017 and 2016.

We regularly review deferred tax assets for recoverability based on our history of earnings, expectations of future earnings, and tax planning strategies. Realization of deferred tax assets ultimately depends on the existence of sufficient taxable income to support the amount of deferred taxes. A valuation allowance is recorded in those circumstances in which we conclude it is not more-likely-than-not we will recover the deferred tax assets prior to their expiration.

During the third quarter of 2015, the Pullmantur trademark and trade names were impaired. As a result of the impairment, there was no longer a difference between the book and tax basis of the trademark and trade names. During the third quarter of 2015, we reversed the deferred tax liability of $43.4 million and increased the deferred tax asset valuation allowance by $31.4 million, or to 100% of the deferred tax asset balance. The resulting net $12.0 million deferred tax benefit was recorded as part of our income tax provision and was reported within Other expense in our consolidated statements of comprehensive income (loss) for the year ended December 31, 2015. Effective July 31, 2016, we sold 51% of our interest in Pullmantur Holdings. For further information on the sale transaction, refer to Note 1. General.