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Revenue Recognition (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) Period Segment | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) Period
Revenue [Abstract] |  |  |  |  |
Transaction price | $ 599,000 |  | $ 599,000 |  |
Number of additional option periods | Period |  |  | 7 |  | 17
Contract revenue | 173,653 | $ 149,434 | $ 511,667 | $ 367,064 |
Number of operating segments | Segment |  |  | 1 |  |
Contract with Customer, Asset and Liability [Abstract] |  |  |  |  |
Accounts receivable | 76,955 |  | $ 76,955 |  | $ 143,653
Deferred costs | 4,000 |  | 4,000 |  | 2,900
Contract with Customer, Liability [Abstract] |  |  |  |  |
Contract liability | 76,133 |  | 76,133 |  |
Deferral of revenue |  |  | 18,384 |  |
Recognition of revenue included in beginning of year contract liability |  |  | (15,121) |  |
Contract liability | $ 76,133 |  | $ 76,133 |  |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |
Contract with Customer, Liability [Abstract] |  |  |  |  |
Contract liability |  |  |  |  | 72,870
Contract liability |  |  |  |  | $ 72,870
CIADM [Member] |  |  |  |  |
Revenue [Abstract] |  |  |  |  |
Term of contract |  |  |  |  | 24 years
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |
Contract with Customer, Liability [Abstract] |  |  |  |  |
Contract liability |  |  |  |  | $ 42,379
Contract liability |  |  |  |  | 42,379
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | CIADM [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |
Revenue [Abstract] |  |  |  |  |
Retained earnings |  |  |  |  | 32,500
Deferred tax assets |  |  |  |  | 9,900
Contract with Customer, Liability [Abstract] |  |  |  |  |
Contract liability |  |  |  |  | 42,400
Contract liability |  |  |  |  | 42,400
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |
Contract with Customer, Liability [Abstract] |  |  |  |  |
Contract liability |  |  |  |  | 30,491
Contract liability |  |  |  |  | $ 30,491

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