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Summary of Significant Accounting Policies - Goodwill and Intangibles (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2017
Intangible Assets:          
Amortization expense $ 800 $ 700 $ 1,500 $ 1,400  
Goodwill 90,197   90,197   $ 87,214
Intangible assets, net 19,449   19,449   20,226
Gross Carrying Amount 42,700   42,700   42,000
Accumulated Amortization (23,300)   (23,300)   (21,800)
Net Carrying Value 19,400   19,400   20,200
Impairment of goodwill         0
Assets written-off 0   0    
Future amortization of intangible assets          
2018 1,500   1,500    
2019 3,000   3,000    
2020 2,900   2,900    
2021 2,400   2,400    
2022 2,200   2,200    
Thereafter 7,200   7,200    
Trade names          
Intangible Assets:          
Gross Carrying Amount 17,600   17,600   17,600
Accumulated Amortization (8,100)   (8,100)   (7,600)
Net Carrying Value 9,500   9,500   10,000
Customer and distributor relationships          
Intangible Assets:          
Gross Carrying Amount 20,500   20,500   20,100
Accumulated Amortization (12,700)   (12,700)   (12,000)
Net Carrying Value 7,800   7,800   8,100
Developed technology          
Intangible Assets:          
Gross Carrying Amount 3,200   3,200   2,900
Accumulated Amortization (2,000)   (2,000)   (1,700)
Net Carrying Value 1,200   1,200   1,200
Other          
Intangible Assets:          
Gross Carrying Amount 1,400   1,400   1,400
Accumulated Amortization (500)   (500)   (500)
Net Carrying Value $ 900   $ 900   $ 900