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Summary of Significant Accounting Policies Organization (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Income Tax Expense (Benefit) | $ 9,892 | $ 16,273 |  |
Total stockholders' equity (deficit) | 1,117,562 | 981,723 | $ 1,097,227 | $ 930,180
Deferred income taxes | 94,381 |  | 86,657 |
Accrued liabilities | 280,076 |  | 255,146 |
Adjustments [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Income Tax Expense (Benefit) |  | $ 0 |  |
Total stockholders' equity (deficit) |  |  | 3,800 |
Deferred income taxes |  |  | 2,400 |
Accrued liabilities |  |  | $ 6,200 |
Adjustments for Change in Accounting Principle [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Income Tax Expense (Benefit) | $ 300 |  |  |

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