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Revenues - Impact of Adoption of Topic 606 (Details) $ in Thousands	Sep. 30, 2018 USD ($)
Assets
Prepaid expenses and other assets	$ 35,171
Liabilities and stockholders' equity
Unearned income	38,234
Calculated under Revenue Guidance in Effect before Topic 606
Assets
Prepaid expenses and other assets	34,807
Liabilities and stockholders' equity
Unearned income	39,104
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
Assets
Prepaid expenses and other assets	(364)
Liabilities and stockholders' equity
Unearned income	$ 870

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
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