Supplemental Cash Flow Information (Tables)

9 Months Ended

Sep. 30, 2018

Supplemental Cash Flow Elements [Abstract]

Components of supplemental cash flow information

Supplemental cash flow information is as follows (in thousands):

	Nine months ended September 30,
	2018		2017
Supplemental non-cash investing and financing activities:
Value of common stock issued in payment of accrued liability	$	—	$	188
Exercise of stock options by common stock surrender	—		5,863
Supplemental cash payment information:
Interest paid	$	1,645	$	1,511
Income taxes paid, net of refunds (received, net of payments)	16		(10,081		)