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Revenue Recognition Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Revenue Recognition and Deferred Revenue [Abstract] |  |  |
Contract with Customer, Asset, Gross | $ 14,300 | $ 14,300 | $ 11,300
Contract with Customer, Liability | 142,400 | 142,400 | 71,100
Contract with customer, revenue recognized | 2,800 | (75,618) |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Deferred Revenue, Current | 94,546 | 94,546 | 41,438
Retained Earnings (Accumulated Deficit) | (469,155) | (469,155) | $ (337,873)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Deferred Revenue | 21,000 | 21,000 |
Deferred Revenue, Current | 9,000 | 9,000 |
Retained Earnings (Accumulated Deficit) | $ 15,000 | $ 15,000 |

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- Definition Amount, before 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84173487&loc=SL51747714-108306 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130549-203045 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130533-203044 + Details
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