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Summary of Significant Accounting Policies Balance Sheet Adjustments (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ 1,097,227 | $ 930,180 | $ 501,837 | $ 438,087
Accrued liabilities | 255,146 | 257,554 |  |
Deferred income taxes | 86,657 | 81,454 |  |
Retained earnings (accumulated deficit) | 164,425 | (23,824) |  |
As Previously Reported [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Accrued liabilities | 248,979 | 251,082 |  |
Deferred income taxes | 89,075 | 83,980 |  |
Retained earnings (accumulated deficit) | 168,174 | (19,878) |  |
Adjustments [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 3,800 |  |  |
Accrued liabilities | 6,167 | 6,472 |  |
Deferred income taxes | (2,418) | (2,526) |  |
Retained earnings (accumulated deficit) | $ (3,749) | $ (3,946) |  |

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