Quarterly report pursuant to Section 13 or 15(d)

Organization and Basis of Presentation - Changes Due to Adoption of Topic 606 for Statements of Cash Flow (Details)

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Organization and Basis of Presentation - Changes Due to Adoption of Topic 606 for Statements of Cash Flow (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Cash and cash equivalents $ 54,736 $ 349,245    
Cash, cash equivalents and restricted cash 62,094 356,559 $ 210,502 $ 179,727
Accounting Standards Update 2014-09        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Cash and cash equivalents 54,736 349,245 196,905 166,252
Restricted cash (recorded within other current assets) 7,358 7,314 13,597 13,475
Cash, cash equivalents and restricted cash $ 62,094 $ 356,559 $ 210,502 $ 179,727