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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

X

- 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
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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

+ References

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- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Contract With Customer Liability, Variable Consideration

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