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Significant Accounting Policies - Recently Adopted Accounting Pronouncements and Accounting Pronouncements Issued but Not Yet Adopted (Details) - USD ($) $ in Thousands | Jan. 01, 2018 | Sep. 30, 2019
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Accounting Standards Update 2014-09 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Change in Accounting Principle, Accounting Standards Update, Adopted |  | true
Change in Accounting Principle, Accounting Standards Update, Adoption Date |  | Jan. 01, 2019
Change in Accounting Principle, Accounting Standards Update, Early Adoption |  | false
Change in Accounting Principle, Accounting Standards Update, Transition Option Elected |  | Retrospective
Accounting Standards Update 2015-17 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Change in Accounting Principle, Accounting Standards Update, Adopted |  | true
Change in Accounting Principle, Accounting Standards Update, Adoption Date |  | Jan. 01, 2018
Change in Accounting Principle, Accounting Standards Update, Early Adoption |  | false
Change in Accounting Principle, Accounting Standards Update, Transition Option Elected |  | Prospective
Accounting Standards Update 2016-09 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Change in Accounting Principle, Accounting Standards Update, Adopted |  | true
Change in Accounting Principle, Accounting Standards Update, Adoption Date |  | Jan. 01, 2018
Change in Accounting Principle, Accounting Standards Update, Early Adoption |  | false
Change in Accounting Principle, Accounting Standards Update, Transition Option Elected |  | Prospective
Impact of adoption of 2016- 09 | $ (213,000) |
Accounting Standards Update 2016-15 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Change in Accounting Principle, Accounting Standards Update, Adopted |  | true
Change in Accounting Principle, Accounting Standards Update, Adoption Date |  | Jan. 01, 2018
Change in Accounting Principle, Accounting Standards Update, Early Adoption |  | false
Accounting Standards Update 2017-04 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Change in Accounting Principle, Accounting Standards Update, Adopted |  | true
Change in Accounting Principle, Accounting Standards Update, Adoption Date |  | Jan. 01, 2018
Change in Accounting Principle, Accounting Standards Update, Early Adoption |  | true
Change in Accounting Principle, Accounting Standards Update, Transition Option Elected |  | Prospective
Accounting Standards Update 2017-01 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Change in Accounting Principle, Accounting Standards Update, Adopted |  | true
Change in Accounting Principle, Accounting Standards Update, Adoption Date |  | Jan. 01, 2019
Change in Accounting Principle, Accounting Standards Update, Early Adoption |  | false
Accounting Standards Update 2017-09 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Change in Accounting Principle, Accounting Standards Update, Adopted |  | true
Change in Accounting Principle, Accounting Standards Update, Adoption Date |  | Jan. 01, 2018
Change in Accounting Principle, Accounting Standards Update, Early Adoption |  | false
Accounting Standards Update 2018-07 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Change in Accounting Principle, Accounting Standards Update, Adopted |  | true
Change in Accounting Principle, Accounting Standards Update, Adoption Date |  | Jan. 01, 2019
Change in Accounting Principle, Accounting Standards Update, Early Adoption |  | false
Accounting Standards Update 2016-02 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Change in Accounting Principle, Accounting Standards Update, Adopted |  | false
Change in Accounting Principle, Accounting Standards Update, Early Adoption |  | false
Change in Accounting Principle, Accounting Standards Update, Transition Option Elected |  | Modified Retrospective

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