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Basis Of Presentation And New Accounting Standards (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Assets |  |  |  |  |  |
Unbilled and other |  | $ 66,396 |  | $ 66,396 |  | $ 29,947
Other current assets |  | 47,450 |  | 47,450 |  | 41,768
Liabilities |  |  |  |  |  |
Accrued liabilities |  | 84,431 |  | 84,431 |  | 71,680
Deferred tax liabilities |  | 102,742 |  | 102,742 |  | 103,349
Equity |  |  |  |  |  |
Retained earnings |  | 396,781 |  | 396,781 |  | $ 352,906
Statement of Operations |  |  |  |  |  |
Net revenues |  | 212,575 | $ 163,260 | 581,462 | $ 418,117 |
Income from operations |  | 31,377 | 4,767 | 55,033 | (7,888) |
Income before income taxes |  | 27,962 | 751 | 43,571 | (21,645) |
Income tax provision |  | 841 | (1,539) | 1,226 | (1,117) |
Net income |  | 27,121 | $ 2,290 | 42,345 | $ (20,528) |
Pro Forma Without Adoption of ASC 606 |  |  |  |  |  |
Assets |  |  |  |  |  |
Unbilled and other |  | 67,263 |  | 67,263 |  |
Other current assets |  | 46,104 |  | 46,104 |  |
Liabilities |  |  |  |  |  |
Accrued liabilities |  | 84,705 |  | 84,705 |  |
Deferred tax liabilities |  | 102,584 |  | 102,584 |  |
Equity |  |  |  |  |  |
Retained earnings |  | 396,186 |  | 396,186 |  |
Statement of Operations |  |  |  |  |  |
Net revenues |  | 212,965 |  | 580,709 |  |
Income from operations |  | 31,767 |  | 54,280 |  |
Income before income taxes |  | 28,352 |  | 42,818 |  |
Income tax provision |  | 923 |  | 1,068 |  |
Net income |  | 27,429 |  | 41,750 |  |
Effect of Change | ASC 606 |  |  |  |  |  |
Assets |  |  |  |  |  |
Unbilled and other |  | (867) |  | (867) |  |
Other current assets |  | 1,346 |  | 1,346 |  |
Liabilities |  |  |  |  |  |
Accrued liabilities |  | (274) |  | (274) |  |
Deferred tax liabilities |  | 158 |  | 158 |  |
Equity |  |  |  |  |  |
Retained earnings |  | 595 |  | 595 |  |
Statement of Operations |  |  |  |  |  |
Net revenues |  | (390) |  | 753 |  |
Income from operations |  | (390) |  | 753 |  |
Income before income taxes |  | (390) |  | 753 |  |
Income tax provision |  | (82) |  | 158 |  |
Net income |  | $ (308) |  | $ 595 |  |
Accumulated OCI | ASU No. 2018-02 |  |  |  |  |  |
Statement of Operations |  |  |  |  |  |
Reclassification of net stranded tax benefits | $ (1,500) |  |  |  |  |
Retained Earnings | ASU No. 2018-02 |  |  |  |  |  |
Statement of Operations |  |  |  |  |  |
Reclassification of net stranded tax benefits | $ 1,500 |  |  |  |  |

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