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Basis of Presentation and Consolidation (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Retained Earnings | Accounting Standards Update 2016-16 |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Cumulative effect of new accounting principle |  |  |  |  | $ 3,200,000
Subsequent Event |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Capitalized contract costs |  |  |  | $ 700,000 |
Subsequent Event | Retained Earnings | Accounting Standards Update 2014-09 |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Cumulative effect of new accounting principle |  |  | $ 10,100,000 |  |
Escrow |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |
Restricted cash held in escrow | $ 0 | $ 0 |  |  | $ 30,000,000
Decrease in escrow | $ 6,200,000 | $ (23,800,000) |  |  |

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