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Supplemental Cash Flows (Tables) | 12 Months Ended
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Dec. 31, 2014
Supplemental Cash Flow Information [Abstract] |
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] | ## 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 |

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- Definition Tabular disclosure of supplemental cash flow information for the periods presented. + References No definition available. + Details
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