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Revenue From Contracts With Customers (Narrative) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items] |
Revenue recognized that was included in the contract liability balance at the beginning of the period | $ 40,944
Minimum |
Disaggregation of Revenue [Line Items] |
Period for installation completion | 1 year

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 + Details
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