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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
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

X

- Definition

Indicates (true false) whether accounting standards update was adopted.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
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+ References

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-Topic 250
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+ References

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Amount of the cumulative effect on retained earnings net of related income tax effect.

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+ References

No definition available.

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