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Revenue Recognition - Impacts of adoption in the current period - Narrative (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Contracts |  |  |
Contract asset, current | $ 1,900 |  | $ 1,176
Contract asset, noncurrent | 802 |  | 453
Contract liability | 13,787 |  | 9,912
Deferred income taxes | 10,276 |  | 31,732
Retained earnings | 563,593 |  | 552,948
Minority interest | 127,937 |  | $ 141,496
Prepayments and other current assets |  |  |
Contracts |  |  |
Short-term contract acquisition costs | 1,400 |  |
Other assets |  |  |
Contracts |  |  |
Long-term contract acquisition costs | 1,000 |  |
Change | ASU 2014-09 |  |  |
Contracts |  |  |
Contract asset |  | $ 1,600 |
Contract acquisition costs |  | 1,500 |
Deferred income taxes | 302 | 300 |
Retained earnings | 2,481 | 1,500 |
Minority interest | $ 1,853 | 1,100 |
Change | ASU 2014-09 | Prepayments and other current assets |  |  |
Contracts |  |  |
Contract asset, current |  | 1,200 |
Short-term contract acquisition costs |  | 900 |
Change | ASU 2014-09 | Other assets |  |  |
Contracts |  |  |
Contract asset, noncurrent |  | 400 |
Long-term contract acquisition costs |  | 600 |
Change | ASU 2014-09 | Advance Payments And Deposits |  |  |
Contracts |  |  |
Contract liability |  | $ 200 |

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