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Trade accounts receivable, unbilled services and payments on account Contract Assets and Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Billed services (accounts receivable) | $ 412,933 | $ 412,933 |  | $ 388,431
Unbilled revenue | 274,501 | 274,501 |  | 268,509
Trade accounts receivable and unbilled revenue | 687,434 | 687,434 |  | 656,940
Allowance for doubtful accounts | (8,361) | (8,361) |  | (8,930)
Trade accounts receivable and unbilled revenue, net | 679,073 | 679,073 |  | 648,010
Unearned revenue (payments on account) | (326,741) | (326,741) |  | (298,992)
Change in unbilled receivables | $ 5,992 |  |  |
Change in unbilled receivables, percent | 2.20% |  |  |
Change in customer advances and deposits | $ 27,749 | 27,700 |  |
Change in customer advances and deposits, percent | 9.30% |  |  |
Net balance | $ (52,240) | (52,240) |  | $ (30,483)
Change in advance payments netted against unbilled contracts receivable | $ 21,757 | 21,800 |  |
Change in advance payments netted against unbilled contracts receivable, percent | (71.40%) |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Unbilled revenue | $ 44,829 | $ 44,829 | $ 42,000 |

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