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Revenue - Narrative (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jul. 01, 2018
Jun. 30, 2018
Disaggregation of Revenue [Line Items]      
Change in deferred margin $ 0   $ (1,665)
Change in accounts receivable (37,108)   (33,755)
Change in current accrued liabilities 56,054   $ 49,841
Accounting Standards Update 2014-09      
Disaggregation of Revenue [Line Items]      
Net increase to opening retained earnings   $ 1,000  
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606      
Disaggregation of Revenue [Line Items]      
Change in deferred margin (1,691) 1,600  
Change in accounts receivable (224) 200  
Change in current accrued liabilities $ (120) 100  
Change in deferred tax assets   $ 300