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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accounting Policies [Abstract] |  |  |
Income tax (benefit), net of refunds | $ 2,186 | $ 9,956 | $ 6,550
Interest, net of amounts capitalized | 189,288 | 184,462 | 170,209
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] |  |  |
Accrued capital expenditures | 130,404 | 114,855 | 83,798
Dividends declared but not paid | $ 77,667 | $ 72,926 | $ 69,363

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