Supplemental Cash Flow Information (Tables)

6 Months Ended

Jun. 30, 2017

Supplemental Cash Flow Elements [Abstract]

Components of supplemental cash flow information

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

	Six months ended June 30,
	2017		2016
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	5,814		—
Supplemental cash payment information:
Interest paid	$	1,069	$	921
Income taxes received, net of payments (paid, net of refunds)	9,489		(3,429		)