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Supplemental Cash Flow Information - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Stockholders' Equity Note [Line Items] |  |  |
Cash interest payments | $ (234,102) | $ (384,157) | $ (367,334)
Net income tax cash payments | 143,000 | 130,469 | $ 128,709
Series A Preferred Stock |  |  |
Stockholders' Equity Note [Line Items] |  |  |
Preferred stock dividends declared and paid | $ (11,103) | $ (18,052) |

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