Income Taxes Income Taxes (table 2)

6 Months Ended

Jun. 30, 2018

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

The provision for income taxes was as follows:

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Income tax provision	$	11,390		$	12,127		$	26,810		$	25,120
Effective tax rate	13.7		%	19.1		%	19.5		%	21.1		%