Revenue Recognition - Opening and Closing Balances (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Revenue from Contract with Customer [Abstract]
Accounts receivable, net	$ 630,119	$ 576,313	$ 576,313
Increase (decrease) in accounts receivables	53,806
Contract asset, current	9,778	9,002	0
Increase (decrease) in contract asset, current	776
Contract asset, non-current	16,396	16,186	0
Increase (decrease) in contract asset, non-current	210
Customer deposits	73,142	71,085
Increase (decrease) in deferred revenue, current	2,057
Deferred revenue, non-current	46,641	$ 53,101	$ 121,257
Increase (decrease) in deferred revenue, non-current	$ (6,460)

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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- 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.

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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.

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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 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.

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