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Borrowings - Convertible Debentures - Additional Information (Details) - Convergys - USD ($)
$ in Thousands
1 Months Ended
Oct. 05, 2018
Dec. 31, 2018
Nov. 30, 2018
Debt Instrument [Line Items]      
Business acquisition date Oct. 05, 2018    
5.75% Junior Subordinated Convertible Debentures due September 2029      
Debt Instrument [Line Items]      
Aggregate principal amount of debentures $ 124,963   $ 55,681
Debenture interest rate percentage 5.75%    
Debt Instrument, Maturity date 2029-09    
Term loan borrowing amount $ 124,963   55,681
Principal amount of convertible debentures settled     $ 118,425
Settlement of aggregate principal amount outstanding   $ 774