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Summary Of Significant Accounting Policies - New Accounting Standards (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2019 | Jan. 01, 2018 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Unbilled and other |  |  | $ 51,943 |  |  |  | $ 29,947 |  |  |  | $ 51,943 | $ 29,947 |
Other current assets |  |  | 51,594 |  |  |  | 41,768 |  |  |  | 51,594 | 41,768 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued liabilities |  |  | 85,594 |  |  |  | 71,680 |  |  |  | 85,594 | 71,680 |
Deferred tax liabilities |  |  | 105,862 |  |  |  | 103,349 |  |  |  | 105,862 | 103,349 |
Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  |  | 383,034 |  |  |  | 352,906 |  |  |  | 383,034 | 352,906 |
Statement of Operations |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  | 158,356 | $ 212,575 | $ 204,625 | $ 164,262 | 163,266 | $ 163,260 | $ 150,329 | $ 104,528 | 739,818 | 581,383 | $ 487,582
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  | 51,543 | (1,130) | (63,235)
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  | 30,998 | (20,372) | (93,915)
Income tax provision (benefit) |  |  |  |  |  |  |  |  |  |  | 2,400 | (50,424) | (12,470)
Net income (loss) |  |  | (13,747) | $ 27,121 | $ 17,784 | $ (2,560) | 50,580 | $ 2,290 | $ (6,403) | $ (16,415) | 28,598 | 30,052 | (81,445)
Reclassification of net stranded tax effect from accumulated OCI to retained earnings |  |  |  |  |  |  |  |  |  |  | 0 |  |
Deferred gain on sale and leaseback transaction |  |  | 5,052 |  |  |  | $ 5,838 |  |  |  | 5,052 | 5,838 |
AOCI |  |  |  |  |  |  |  |  |  |  |  |  |
Statement of Operations |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification of net stranded tax effect from accumulated OCI to retained earnings |  |  |  |  |  |  |  |  |  |  | 1,530 |  |
Retained Earnings |  |  |  |  |  |  |  |  |  |  |  |  |
Statement of Operations |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  |  | 28,598 | $ 30,052 | $ (81,445)
Reclassification of net stranded tax effect from accumulated OCI to retained earnings |  |  |  |  |  |  |  |  |  |  | (1,530) |  |
Pro Forma Without Adoption of ASC 606 |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Unbilled and other |  |  | 57,772 |  |  |  |  |  |  |  | 57,772 |  |
Other current assets |  |  | 45,765 |  |  |  |  |  |  |  | 45,765 |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued liabilities |  |  | 85,491 |  |  |  |  |  |  |  | 85,491 |  |
Deferred tax liabilities |  |  | 105,884 |  |  |  |  |  |  |  | 105,884 |  |
Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  |  | 383,115 |  |  |  |  |  |  |  | 383,115 |  |
Statement of Operations |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  |  | 739,921 |  |
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  | 51,646 |  |
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  | 31,101 |  |
Income tax provision (benefit) |  |  |  |  |  |  |  |  |  |  | 2,422 |  |
Net income (loss) |  |  |  |  |  |  |  |  |  |  | 28,679 |  |
ASC 606 | Effect of Change |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Unbilled and other |  |  | (5,829) |  |  |  |  |  |  |  | (5,829) |  |
Other current assets |  |  | 5,829 |  |  |  |  |  |  |  | 5,829 |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued liabilities |  |  | 103 |  |  |  |  |  |  |  | 103 |  |
Deferred tax liabilities |  |  | (22) |  |  |  |  |  |  |  | (22) |  |
Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  |  | $ (81) |  |  |  |  |  |  |  | (81) |  |
Statement of Operations |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  |  | (103) |  |
Income (loss) from operations |  |  |  |  |  |  |  |  |  |  | (103) |  |
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  | (103) |  |
Income tax provision (benefit) |  |  |  |  |  |  |  |  |  |  | (22) |  |
Net income (loss) |  |  |  |  |  |  |  |  |  |  | $ (81) |  |
ASU No. 2018-02 | AOCI |  |  |  |  |  |  |  |  |  |  |  |  |
Statement of Operations |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification of net stranded tax effect from accumulated OCI to retained earnings |  | $ 1,500 |  |  |  |  |  |  |  |  |  |  |
ASU No. 2018-02 | Retained Earnings |  |  |  |  |  |  |  |  |  |  |  |  |
Statement of Operations |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification of net stranded tax effect from accumulated OCI to retained earnings |  | $ (1,500) |  |  |  |  |  |  |  |  |  |  |
ASC 842 | Minimum | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |
Statement of Operations |  |  |  |  |  |  |  |  |  |  |  |  |
Increases in assets and liabilities | $ 250,000 |  |  |  |  |  |  |  |  |  |  |  |
ASC 842 | Maximum | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |
Statement of Operations |  |  |  |  |  |  |  |  |  |  |  |  |
Increases in assets and liabilities | 270,000 |  |  |  |  |  |  |  |  |  |  |  |
ASC 842 | Retained Earnings | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |
Statement of Operations |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred gain on sale and leaseback transaction | $ 5,100 |  |  |  |  |  |  |  |  |  |  |  |

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