Quarterly report pursuant to Section 13 or 15(d)

Note 11 - Income Taxes

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Note 11 - Income Taxes
3 Months Ended
Mar. 31, 2019
Notes to Financial Statements  
Income Tax Disclosure [Text Block]
11.
Income Taxes
 
The effective income tax rate, which is the provision for income taxes as a percentage of income before provision for income taxes, was 
27.1%
and 
25.0%
for the 
three
months ended
March 31, 2019
and
2018
, respectively.
The increase in
the effective income tax rate for the 
three
months ended
March 31, 2019
is largely
driven by increased tax expense on stock compensation due to a reduction of shares vesting in
2019
and a reduction of the difference between the stock price at grant date and vesting date. Th
e effective income tax rates for the 
three
months ended
March 31, 2019
and 
2018
also differed from the U.S. Federal statutory rate of
21%,
due
to state income taxes, stock compensation, and the utilization of tax credits.
 
As of
March 31, 2019
, and
December 31, 2018
, we had
$23.9
million of unrecognized tax benefits, of which
$8.2
million would impact the effective tax rate, if recognized. Estimated interest and penalties related to the underpayment of income taxes are classified as a component of the provision for income taxes in the accompanying consolidated statements of operations. Accrued interest and penalties as of
March 31, 2019
and 
December 31, 2018
were
$2.8
million and
$2.5
million, respectively. Our liability for uncertain tax positions, including accrued interest and penalties, of
$26.7
million and
$26.4
million at 
March 31, 2019
and
December 31, 2018
, respectively, are presented in other noncurrent liabilities in the accompanying consolidated balance sheets.
 
Our U.S. federal returns for the period ended
December 
31,
2015
and all subsequent periods remain open for audit. In addition, the majority of state returns for the period ended
December 
31,
2014
and all subsequent
periods remain open for audit.