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Organization and Basis of Presentation - Changes Due to Adoption of Topic 606 (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Oct. 01, 2018 | Sep. 30, 2018
--- | --- | --- | ---
ASSETS |  |  |
Accounts receivable — unbilled | $ 124,385 | $ 66,950 | $ 31,536
Deferred income taxes | 209 | 209 | 6,834
LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  |
Deferred revenue - current | 37,231 | 39,415 | 51,182
Deferred income taxes - long-term | 49,617 | 33,451 | 26,377
Retained earnings | 664,332 | 666,210 | 633,281
Noncontrolling interests | 2,782 | 3,105 | 2,552
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |
ASSETS |  |  |
Accounts receivable — unbilled | (34,233) | 35,414 |
Deferred income taxes | 6,743 | (6,625) |
LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  |
Deferred revenue - current | 12,521 | (11,767) |
Deferred income taxes - long-term | (6,764) | 7,074 |
Retained earnings | (33,349) | 32,929 | $ 32,900
Noncontrolling interests | $ (723) | $ 553 |

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