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Supplemental Cash Flow Information (Tables) | 6 Months Ended
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Jun. 30, 2014
Supplemental Cash Flow Elements [Abstract] |
Supplemental Cash Flow Information |
| Three months ended |  | Six months ended
| June 30, 2014 |  | June 30, 2013 |  | June 30, 2014 |  | June 30, 2013
Supplemental disclosures: | (in thousands) |  |  |  |
Income taxes paid | $ | 9,850 |  |  | $ | 5,904 |  |  | 10,533 |  |  | 6,089 |
Non-cash investing and financing activities: |  |  |  |  |  |  |  |  |  |  |
Non-cash capital expenditures | 262 |  |  | 274 |  |  | 264 |  |  | 290 |

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