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Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Supplemental non-cash investing and financing activities: |  |
Value of common stock issued in payment of accrued liability | $ 0 | $ 188
Exercise of stock options by common stock surrender | 0 | 7
Supplemental cash payment information: |  |
Interest paid | 457 | 553
Income taxes paid, net of refunds (received, net of payments) | $ 71 | $ (114)

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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 + Details
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