Income taxes	6 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income taxes	Income taxes On December 22, 2017, the Tax Cut and Jobs Act ("TCJA") was enacted in the United States. The TCJA significantly changed U.S. corporate tax impacts by, among other things, lowering the corporate tax rate to 21% from 35% effective January 1, 2018, implementing a territorial tax system and imposing a one-time repatriation tax on previously untaxed, accumulated earnings of foreign subsidiaries. As a result of the new tax law, the Securities and Exchange Commission ("SEC") staff issued Staff Accounting Bulletin No. 118 ("SAB 118"). SAB 118 allows companies to record the tax impacts of the new law as provisional amounts during a measurement period of up to one year from the enactment date of the new law. The Company applied SAB 118 when accounting for the enactment-date effects of the TCJA for the year ended December 31, 2017 and recorded provisional amounts related to the one-time transition tax for the repatriation of foreign earnings and the revaluation of deferred tax balances. The Company expects to complete its analysis of the historical earnings and profits of all of its foreign subsidiaries and record any adjustment to the provisional amounts within the one year measurement period. As of June 30, 2018, the Company has not completed its 2017 Federal income tax return or the analysis for all of the tax effects of the TCJA and has not recorded any adjustments to the amounts recorded at year-end.

Income taxes

On December 22, 2017, the Tax Cut and Jobs Act ("TCJA") was enacted in the United States. The TCJA significantly changed U.S. corporate tax impacts by, among other things, lowering the corporate tax rate to 21% from 35% effective January 1, 2018, implementing a territorial tax system and imposing a one-time repatriation tax on previously untaxed, accumulated earnings of foreign subsidiaries. As a result of the new tax law, the Securities and Exchange Commission ("SEC") staff issued Staff Accounting Bulletin No. 118 ("SAB 118"). SAB 118 allows companies to record the tax impacts of the new law as provisional amounts during a measurement period of up to one year from the enactment date of the new law.

The Company applied SAB 118 when accounting for the enactment-date effects of the TCJA for the year ended December 31, 2017 and recorded provisional amounts related to the one-time transition tax for the repatriation of foreign earnings and the revaluation of deferred tax balances. The Company expects to complete its analysis of the historical earnings and profits of all of its foreign subsidiaries and record any adjustment to the provisional amounts within the one year measurement period.

As of June 30, 2018, the Company has not completed its 2017 Federal income tax return or the analysis for all of the tax effects of the TCJA and has not recorded any adjustments to the amounts recorded at year-end.