Income Taxes (Tables)

3 Months Ended

Mar. 31, 2018

Income Tax Uncertainties [Abstract]

Unrecognized Tax Benefits Related To Uncertain Tax Positions [Table Text Block]

The net interest and penalties expense recognized were as follows:

	Three Months Ended March 31,
	2018		2017
	(in thousands)
Net interest and penalties expense	$	424	$	206

Accrued interest and penalties recognized were as follows:

	March 31, 2018		December 31, 2017
	(in thousands)
Accrued interest	$	3,155	$	2,706
Accrued penalties	2,513		2,426

Unrecognized tax benefits related to uncertain tax positions and the amount of unrecognized tax benefits that, if recognized, would affect our effective tax rate were as follows:

	March 31, 2018		December 31, 2017
	(in thousands)
Unrecognized tax benefits related to uncertain tax positions	$	76,120	$	56,702
The amount of unrecognized tax benefits that, if recognized, would affect our effective tax rate	74,671		55,312