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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, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Jun. 30, 2016
Assumptions:          
Service cost     $ 1,069   $ 2,409
Interest cost     533   1,467
Net pension expense     2,061 $ 2,325  
Pension Plan          
Assumptions:          
Service cost $ 409 $ 613 1,069 1,250  
Interest cost 244 369 533 732  
Amortization of actuarial (gains) and losses 178 116 369 223  
Net pension expense 831 1,098 1,971 2,205  
Pension Plan | CDT          
Assumptions:          
Service cost 112 104 232 211 422
Interest cost 109 151 226 305 610
Amortization of actuarial (gains) and losses 150 105 310 212  
Net pension expense 371 360 768 728  
Pension Plan | GXS Germany          
Assumptions:          
Service cost 94 85 195 188 359
Interest cost 90 137 186 265 543
Amortization of actuarial (gains) and losses 40 11 83 11  
Net pension expense 224 233 464 464  
Pension Plan | GXS Philippines          
Assumptions:          
Service cost 203 424 642 851 1,628
Interest cost 45 81 121 162 $ 314
Amortization of actuarial (gains) and losses (12) 0 (24) 0  
Net pension expense $ 236 $ 505 $ 739 $ 1,013