Income taxes	9 Months Ended
Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income taxes	Income taxes The Company's effective income tax rate from continuing operations was 31.1% for the third quarter of 2018 as compared to 26.2% for the second quarter of 2018 and 31.3% for the third quarter of 2017. The Company's effective income tax rate increased in the third quarter of 2018 as compared to the second quarter of 2018 due to non-deductible advocacy costs and additional non-deductible expenses related to the Tax Cuts and Jobs Act of 2017 (2017 Tax Act), partially offset by return to provision adjustments. As of September 30, 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 $40,376, of which $37,533 would impact the Company's effective tax rate if recognized. The total balance increased $7,600 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 September 30, 2018 and December 31, 2017, the Company had approximately $8,296 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 2017 Tax Act and recorded a reasonable estimate of its effect at December 31, 2017. The Company is in the process of completing its analysis with regards to the 2017 Tax Act and will record any adjustments to its estimate on or before December 22, 2018. As of September 30, 2018, the Company has not made any material adjustments to its December 31, 2017 estimates.

Income taxes

The Company's effective income tax rate from continuing operations was 31.1% for the third quarter of 2018 as compared to 26.2% for the second quarter of 2018 and 31.3% for the third quarter of 2017. The Company's effective income tax rate increased in the third quarter of 2018 as compared to the second quarter of 2018 due to non-deductible advocacy costs and additional non-deductible expenses related to the Tax Cuts and Jobs Act of 2017 (2017 Tax Act), partially offset by return to provision adjustments.

As of September 30, 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 $40,376, of which $37,533 would impact the Company's effective tax rate if recognized. The total balance increased $7,600 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 September 30, 2018 and December 31, 2017, the Company had approximately $8,296 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 2017 Tax Act and recorded a reasonable estimate of its effect at December 31, 2017. The Company is in the process of completing its analysis with regards to the 2017 Tax Act and will record any adjustments to its estimate on or before December 22, 2018. As of September 30, 2018, the Company has not made any material adjustments to its December 31, 2017 estimates.