Dispositions (Assets and Liabilities Held for Sale) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Assets
Total current assets held for sale	$ 0	$ 18,439
Goodwill	345,588	161,765	$ 223,176
Deferred income tax asset	0	560
Liabilities
Current liabilities held for sale	0	$ 11,107
GIBBSCam Cimatron | Discontinued Operations, Held-for-sale or Disposed of by Sale
Assets
Cash and cash equivalents	9,161
Accounts receivable, net of reserves of $1,154	5,361
Inventories	155
Prepaid expenses and other current assets	3,762
Total current assets held for sale	18,439
Property and equipment, net	202
Intangible assets, net	6,642
Goodwill	21,385
Right of use assets	898
Deferred income tax asset	560
Other assets	1,997
Total assets held for sale	50,123
Liabilities
Current right of use liabilities	445
Accounts payable	654
Accrued and other liabilities	5,631
Customer deposits	25
Deferred revenue	4,352
Current liabilities held for sale	11,107
Long-term right of use liabilities	518
Other liabilities	2,434
Total liabilities held for sale	14,059
Accounts receivable, reserves	$ 1,154