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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncement, Early Adoption |  |
Other long-term assets | $ 252,854 | $ 230,090
Long-term Debt, Excluding Current Maturities, Total | 4,027,766 | 3,578,335
Accrued liabilities | 533,044 | 543,248
Retained earnings | 1,423,154 | $ 2,033,427
Accounting Standards Update 2016-09 |  |
New Accounting Pronouncement, Early Adoption |  |
Decrease in deferred tax liabilities | 7,100 |
Decrease in capital in excess | 1,900 |
Accounting Standards Update 2016-01 |  |
New Accounting Pronouncement, Early Adoption |  |
Adjustment to retained earnings | 9,100 |
Adjustment | Accounting Standards Update 2016-09 |  |
New Accounting Pronouncement, Early Adoption |  |
Increase in retained earnings | $ 7,100 |

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