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Consolidation and Nature of Operations (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2016 | Jun. 30, 2015
Cash paid during the period for: |  |
Income taxes, net of refunds | $ 2,503 | $ 1,834
Interest, net of amounts capitalized | 89,109 | 84,008
Significant non-cash investing and financing activities: |  |
Accrued capital expenditures | 55,286 | 38,985
Dividends accrued but not yet paid | $ 69,484 | $ 65,933

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