Supplemental Cash Flow Information (Tables)

3 Months Ended

Mar. 31, 2014

Supplemental Cash Flow Elements [Abstract]

Components of supplemental cash flow information

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

	Three months ended March 31,
	2014		2013
Supplemental non-cash investing and financing activities:
Value of common stock issued in acquisition of EOGA	$	1,750	$	—
Value of common stock issued in payment of accrued liability	600		—
Equipment acquired through capital leases	—		480
Exercise of stock options by common stock surrender	1,005		2,357
Supplemental cash payment information:
Interest paid	$	360	$	381
Income taxes paid	2,039		3,537