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Borrowings - Components of Borrowings (Details)
$ in Thousands
Jun. 30, 2019
USD ($)
Debt Instrument [Line Items]  
Outstanding Balance $ 200,000
Senior notes | Series B Senior Notes  
Debt Instrument [Line Items]  
Outstanding Balance $ 50,000
Interest Rate Per Annum 5.32%
Senior notes | Series C  
Debt Instrument [Line Items]  
Outstanding Balance $ 90,000
Interest Rate Per Annum 5.82%
Senior notes | Series D  
Debt Instrument [Line Items]  
Outstanding Balance $ 60,000
Interest Rate Per Annum 4.29%
Revolving credit agreement  
Debt Instrument [Line Items]  
Outstanding Balance $ 0