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Revenue from Contract with Customers - Contract Balances (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Disaggregation of Revenue
Accounts receivable, trade	$ 146,831		$ 147,985
Contract liability with customer	11,600		17,100
Deferred revenue recognized in earnings	25,227	$ 11,274
Contract with customers
Disaggregation of Revenue
Accounts receivable, trade	$ 139,300		$ 142,100

X

- Definition

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, 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.

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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.

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