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Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016
Supplemental Cash Flow Information [Abstract] |  |
Interest paid | $ 20,356 | $ 18,008
Noncash investing and financing activity |  |
Capital projects incurred but not yet paid | 6,319 | 13,104
Investment merger (decreasing equity method investments and non-controlling interest) | 8,360 | 0
Dividends declared not yet paid | $ 4,501 | $ 4,342

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