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Leases - Impact of the adoption of new lease accounting guidance (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jul. 01, 2019
Jun. 30, 2019
Sep. 30, 2018
Jun. 30, 2018
Lessee, Lease, Description [Line Items]          
Total assets $ 1,105,296   $ 1,084,850    
Total liabilities 983,127   964,209    
Total equity $ 122,169   $ 120,641 $ 121,680 $ 120,457
Accounting Standards Update 2016-02 [Member]          
Lessee, Lease, Description [Line Items]          
Total assets   $ 1,088,249      
Total liabilities   967,913      
Total equity   120,641      
Accounting Standards Update 2016-02 [Member] | Adjustments due to new lease guidance          
Lessee, Lease, Description [Line Items]          
Total assets   3,399      
Total liabilities   $ 3,704