Investments Investments (Tables)

3 Months Ended

Mar. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Marketable Securities [Table Text Block]

The following table summarizes the Company’s investments (in thousands):

	March 31, 2018		December 31, 2017
Equity securities	$	44,702	$	34,977
Corporate debt securities	20,245		22,745
Total	$	64,947	$	57,722