Revenue - Opening and Closing Balances (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Accounts receivable, net	$ 703,835	$ 630,119	$ 630,119
Increase (decrease) in accounts receivables	73,716
Contract asset, current	9,753	9,778
Increase (decrease) in contract asset, current	(25)
Contract asset, non-current	16,543	16,396
Increase (decrease) in contract asset, non-current	147
Deferred revenue, current	76,240	73,142
Increase (decrease) in deferred revenue, current	3,098
Deferred revenue, non-current	45,401	$ 46,641
Increase (decrease) in deferred revenue, non-current	$ (1,240)

Increase (Decrease) in Contract With Customer Asset, Net, Current

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- Definition

Increase (Decrease) in Contract With Customer Asset, Net, Noncurrent

+ References

No definition available.

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- Definition

Increase (Decrease) in Contract With Customer Liability, Net, Current

+ References

No definition available.

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- Definition

Increase (Decrease) in Contract With Customer Liability, Net, Noncurrent

+ References

No definition available.

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- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

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-Publisher FASB
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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

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- Definition

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

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- Definition

The increase (decrease) during the reporting period in the total amount due within one year (or one operating cycle) from all parties, associated with underlying transactions that are classified as operating activities.

+ References

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