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Supplemental Cash Flows
12 Months Ended
Dec. 31, 2014
Supplemental Cash Flow Information [Abstract]  
Cash Flow, Supplemental Disclosures [Text Block]

13. Supplemental Cash Flows

Supplemental disclosures of cash flow information are as follows for the years ended December 31:
 
 
(in thousands)
2014
2013
2012
Cash paid during the period for:
Income taxes
$
17,403
$
18,115
$
16,926
Interest expense
577
571
670
Noncash investing activities:
Acquisition of property and equipment for which payment is pending
749
804
390