Revenues, net - Contracts with Customer, Receivables and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Accounts receivable, net	$ 171,864	$ 164,752
Contract assets	5,391	5,445
Contract liabilities
Deferred revenue (consideration received in advance)	11,259	6,345
Consideration received for process transition activities	$ 3,036	$ 1,669

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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