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Pension Plans and Other Post Retirement Benefits - Components of Net Pension Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2019
Assumptions:          
Net pension expense     $ 2,895 $ 2,254  
Pension Plan          
Assumptions:          
Service cost $ 534 $ 435 1,054 897 $ 1,887
Interest cost 287 352 570 711 1,431
Amortization of actuarial (gains) and losses 224 69 448 138  
Net pension expense 1,045 856 2,072 1,746  
Pension Plan | CDT defined benefit plan          
Assumptions:          
Service cost 144 136 286 277 550
Interest cost 115 159 229 324 642
Amortization of actuarial (gains) and losses 235 175 469 351  
Net pension expense 494 470 984 952  
Pension Plan | GXS GER defined benefit plan          
Assumptions:          
Service cost 80 140 159 285 566
Interest cost 84 121 168 247 489
Amortization of actuarial (gains) and losses 61 33 122 66  
Net pension expense 225 294 449 598  
Pension Plan | GXS PHP defined benefit plan          
Assumptions:          
Service cost 310 159 609 335 771
Interest cost 88 72 173 140 $ 300
Amortization of actuarial (gains) and losses (72) (139) (143) (279)  
Net pension expense $ 326 $ 92 $ 639 $ 196