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Revenue - Contract Assets and Liabilities From Contracts with Customers (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Contract assets | $ 3,852 | $ 3,819
Contract liabilities | 1,087,795 | 927,444
Accounts receivable, net |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Contract assets | 38,198 | 32,949
Other assets |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Contract assets | 19,545 | 19,232
Other current liabilities |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Contract liabilities | $ 3,870 | $ 7,612

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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. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130532-203044 Reference 3: 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 + Details
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