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Revenue From Contracts With Customers (Changes in Contract Assets and Contract Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jan. 01, 2018
Contract liabilities
Customer deposits - current	$ 36,967
Deferred revenue - current	11,307
Deferred revenue - long-term	$ 1,374
Calculated under Revenue Guidance in Effect before Topic 606
Contract liabilities
Customer deposits - current		$ 36,937
Deferred revenue - current		9,571
Deferred revenue - long-term		182
Difference between Revenue Guidance in Effect before and after Topic 606 | ASC 606
Contract liabilities
Customer deposits - current		$ 30
Customer deposits, Change		0.10%
Deferred revenue - current		$ 1,736
Deferred revenue - current, Change		18.10%
Deferred revenue - long-term		$ 1,192
Deferred revenue - long-term, Change		654.90%

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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.

+ References

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