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Contract Balances (Details) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Jan. 01, 2019
Change in Contract with Customer, Asset and Liability [Abstract] |  |  |  |
Revenue recognized that was included in the contract liability balance at the beginning of the period | $ (26,113) | $ (27,701) |  |
Contract with Customer, Asset and Liability [Abstract] |  |  |  |
Contract assets balance | 16,423 |  | $ 14,894 | $ 9,330
Contract liabilities - current | 78,258 |  | 44,001 | 36,461
Contract liabilities - non-current | $ 12,247 |  | $ 9,121 | $ 9,382

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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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130531-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130533-203044 + Details
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