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Revenue - Effect on Balance Sheet (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jul. 01, 2018
Jun. 30, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Accounts receivable, net $ 37,108   $ 33,755
Deferred income tax assets 4,918   4,892
Accrued liabilities 56,054   49,841
Income taxes payable 2,218   2,211
Deferred margin 0   1,665
Deferred income tax liabilities 1,063   713
Retained earnings 126,083   $ 122,639
Effect of Change | Accounting Standards Update 2014-09      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Accounts receivable, net 224 $ (200)  
Accrued liabilities (120) 100  
Deferred margin 1,691 $ (1,600)  
Deferred income tax liabilities (285)    
Retained earnings (1,062)    
Balances Without Adoption      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Accounts receivable, net 37,332    
Accrued liabilities 55,934    
Deferred margin 1,691    
Deferred income tax liabilities 778    
Retained earnings $ 125,021