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Revenue from Contracts with Customers - Schedule of Contract with Customer, Asset and Liability (Details) - USD ($) $ in Thousands		Jun. 30, 2018	Dec. 31, 2017
Revenue from Contracts with Customers [Abstract]
Contract assets, current		$ 156,134	$ 122,621
Contract assets, non-current		0	0
Contract liabilities, current		(551,614)	(524,156)
Contract liabilities, non-current		(3,327)	0
Deferred revenue (1)	[1]	0	(47,328)
Net contract liabilities		$ (398,807)	$ (448,863)
[1] Represents deferred revenue on service contracts, which was included in “Accrued expenses and other” and “Other long-term liabilities” in the Condensed Consolidated Balance Sheet as of December 31 2017. For the periods after December 31, 2017, these amounts are included within “Contract liabilities.”

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Net contract assets and liabilities.

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Revenue from Contracts with Customers [Abstract]

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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.

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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 noncurrent.

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

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Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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