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Revenue Recognition - Impacts of adoption in the current period - (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Jan. 02, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Contracts |  |  |  |
Contract asset, current | $ 1,309 | $ 1,176 |  |
Contract asset, noncurrent | 498 | 453 |  |
Contract liability | 9,827 | $ 9,912 |  |
Deferred tax liability | 30,945 |  |  | $ 31,732
Retained earnings | 546,368 |  |  | 552,948
Minority interest | 133,408 |  |  | $ 141,496
Prepayments and other current assets |  |  |  |
Contracts |  |  |  |
Contract acquisition costs, current | 1,100 |  |  |
Other assets |  |  |  |
Contracts |  |  |  |
Contract acquisition costs, noncurrent | 800 |  |  |
Change |  |  |  |
Contracts |  |  |  |
Retained earnings |  |  | $ 1,500 |
Minority interest |  |  | 1,100 |
Change | ASU 2014-09 |  |  |  |
Contracts |  |  |  |
Contract asset |  |  | 1,600 |
Contract acquisition costs |  |  | 1,500 |
Deferred tax liability | 301 |  | 300 |
Retained earnings | 1,725 |  |  |
Minority interest | $ 1,328 |  |  |
Change | ASU 2014-09 | Prepayments and other current assets |  |  |  |
Contracts |  |  |  |
Contract asset, current |  |  | 1,200 |
Contract acquisition costs, current |  |  | 900 |
Change | ASU 2014-09 | Other assets |  |  |  |
Contracts |  |  |  |
Contract asset, noncurrent |  |  | 400 |
Retained earnings |  |  | 600 |
Change | ASU 2014-09 | Advance Payments And Deposits |  |  |  |
Contracts |  |  |  |
Contract liability |  |  | $ 200 |

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