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Revenue - Contract Assets and Liabilities From Contracts with Customers (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Revenue from Contract with Customer [Abstract] |  |  |  |
Variable consideration | $ 235,300 | $ 656,500 |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Contract assets | 7,709 | 7,709 | $ 7,053 |
Short-term deposits | 878,071 | 878,071 |  | $ 986,989
Contract liability, revenue recognized | 2,900 | 8,200 |  |
Accounts receivable, net |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Contract assets | 27,738 | 27,738 | 30,386 |
Other assets |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Contract assets | 47,646 | 47,646 | 49,068 |
Other current liabilities |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Short-term deposits | $ 23,723 | $ 23,723 | $ 26,592 |

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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130533-203044 + Details
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