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Consolidation and Nature of Operations (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Cash paid during the period for: |  |
Income taxes, net of refunds | $ 10,032 | $ 2,062
Interest, net of amounts capitalized | 104,249 | 94,870
Significant non-cash investing and financing activities: |  |
Accrued capital expenditures | 65,995 | 80,517
Dividends declared but not yet paid | $ 77,821 | $ 73,113

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