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Supplemental Cash Flow Information
 12 Months Ended
Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]  
Supplemental Cash Flow Information
Supplemental Cash Flow Information
Supplemental cash flow information is as follows (in thousands):
 
Year ended December 31,
 
2017
 
2016
 
2015
Supplemental non-cash investing and financing activities:
 
 
 
 
 
Value of common stock issued in acquisitions
$
—

 
$
3,268

 
$
1,014

Value of common stock issued in payment of accrued liability
188

 
—

 
—

Exercise of stock options by common stock surrender
5,863

 
50

 
1,332

 
 
 
 
 
 
Supplemental cash payment information:
 
 
 
 
 
Interest paid
$
1,851

 
$
2,024

 
$
1,398

Income taxes (received, net of payments) paid, net of refunds
(10,195
)
 
333

 
1,547