Income taxes	3 Months Ended
Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income taxes	Income taxes As of March 31, 2018, the Company’s total liability for unrecognized tax benefits relating to tax positions that do not meet the more-likely-than-not threshold was $33,880, all of which would impact the Company’s effective tax rate if recognized. This balance represents an increase of $1,104 from the December 31, 2017 balance of $32,776. The Company recognizes accrued interest and penalties related to unrecognized tax benefits in its income tax expense. At March 31, 2018 and December 31, 2017, the Company had approximately $3,971 and $4,195, respectively, accrued for interest and penalties related to unrecognized tax benefits, net of federal tax benefits. The Company performed a provisional analysis of the Tax Cuts and Jobs Act of 2017 (2017 Tax Act) and recorded a reasonable estimate of its effect for the year ended December 31, 2017. The Company is in the process of completing its analysis with respect to the 2017 Tax Act and will record any adjustments to its estimate on or before December 22, 2018, with any adjustments to be recorded to income tax expense in the period when the adjustments are determined. As of March 31, 2018, the Company has not made any material adjustments to the December 31, 2017 estimates. The 2018 effective tax rate reduction is primarily due to the impact of the 2017 Tax Act which reduced the federal tax rate from 35% to 21%.

Income taxes

As of March 31, 2018, the Company’s total liability for unrecognized tax benefits relating to tax positions that do not meet the more-likely-than-not threshold was $33,880, all of which would impact the Company’s effective tax rate if recognized. This balance represents an increase of $1,104 from the December 31, 2017 balance of $32,776.

The Company recognizes accrued interest and penalties related to unrecognized tax benefits in its income tax expense. At March 31, 2018 and December 31, 2017, the Company had approximately $3,971 and $4,195, respectively, accrued for interest and penalties related to unrecognized tax benefits, net of federal tax benefits.

The Company performed a provisional analysis of the Tax Cuts and Jobs Act of 2017 (2017 Tax Act) and recorded a reasonable estimate of its effect for the year ended December 31, 2017. The Company is in the process of completing its analysis with respect to the 2017 Tax Act and will record any adjustments to its estimate on or before December 22, 2018, with any adjustments to be recorded to income tax expense in the period when the adjustments are determined. As of March 31, 2018, the Company has not made any material adjustments to the December 31, 2017 estimates. The 2018 effective tax rate reduction is primarily due to the impact of the 2017 Tax Act which reduced the federal tax rate from 35% to 21%.