Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Supplemental non-cash investing and financing activities:
Common stock issued in payment of accrued liability	$ 188	$ 0
Exercise of stock options by common stock surrender	7	0
Supplemental cash payment information:
Interest paid	553	382
Income taxes paid, net of refunds	$ 114	$ 2,264