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Supplemental Cash Flows (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Supplemental Cash Flows |  |  |
Income taxes | $ 18,115 | $ 16,926 | $ 9,151
Interest expense | 571 | 670 | 524
Noncash investing activities: |  |  |
Acquisition of property and equipment for which payment is pending | $ 804 | $ 390 | $ 901

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