Recent Accounting Pronouncements - Additional Informaiton (Details) - Accumulated Other Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Dec. 31, 2017	Sep. 30, 2018
New Accounting Pronouncement Early Adoption [Line Items]
Reclassification of effects of tax reform enactment		$ (3,466)
ASU No 2018-02
New Accounting Pronouncement Early Adoption [Line Items]
Reclassification of effects of tax reform enactment	$ 3,466

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