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Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accounting Policies [Abstract] |  |  |
Income tax (benefit), net of refunds | $ 21,173 | $ 2,186 | $ 9,956
Interest, net of amounts capitalized | 208,479 | 189,288 | 184,462
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] |  |  |
Accrued capital expenditures | 132,620 | 130,404 | 114,855
Dividends declared but not paid | 82,675 | 77,667 | 72,926
Sale of 4CA 7% interest in Four Corners | $ 68,907 | $ 0 | $ 0

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