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Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Supplemental Cash Flow Information [Abstract] |  |
Interest paid | $ 8,670 | $ 5,731
Noncash investing and financing activity |  |
Capital projects incurred but not yet paid | 2,216 | 7,305
Investment merger | 8,360 | 0
Outstanding receivable for sale of assets | 3,597 | 0
Dividends declared not yet paid | $ 4,501 | $ 4,341

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