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Leases - Impact of the adoption of new lease accounting guidance (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Jul. 01, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Lessee, Lease, Description [Line Items]              
Total assets $ 1,107,567     $ 1,084,850      
Total liabilities 984,409     964,209      
Total equity $ 123,158 $ 123,776   $ 120,641 $ 121,209 $ 122,677 $ 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