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Supplemental Cash Flow Information
 12 Months Ended
Dec. 31, 2014
Supplemental Cash Flow Elements [Abstract]  
Supplemental Cash Flow Information
Supplemental Cash Flow Information
 
 
Years Ending December 31,
 
2014
 
2013
 
2012
Supplemental disclosures:
(in thousands)
Interest paid
$
—

 
$
1

 
$
44

Income taxes paid, net
26,456

 
19,884

 
15,128

Non-cash investing and financing activities:
 
 
 
 
 
Non-cash capital expenditures
(79
)
 
71

 
(3,670
)
Trade-in of equipment
—

 
315

 
300