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Nature of Operations and Summary of Significant Accounting Policies - Goodwill (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2017
USD ($)
Goodwill [Roll Forward]  
Gross Balance, Beginning Balance $ 236,964
Accumulated impairment losses (85,509)
Net Balance, Beginning Balance 151,455
Acquisitions 99,883
Currency translation 13,502
Total 2017 adjustments 113,385
Gross Balance, Ending Balance 350,349
Accumulated impairment losses (85,509)
Net Balance, Ending Balance 264,840
Operating Segment [Member] | Papermaking Systems [Member]  
Goodwill [Roll Forward]  
Gross Balance, Beginning Balance 219,699
Accumulated impairment losses (85,509)
Net Balance, Beginning Balance 134,190
Acquisitions 15,277
Currency translation 9,937
Total 2017 adjustments 25,214
Gross Balance, Ending Balance 244,913
Accumulated impairment losses (85,509)
Net Balance, Ending Balance 159,404
Operating Segment [Member] | Wood Processing Systems [Member]  
Goodwill [Roll Forward]  
Gross Balance, Beginning Balance 17,265
Accumulated impairment losses 0
Net Balance, Beginning Balance 17,265
Acquisitions 84,606
Currency translation 3,565
Total 2017 adjustments 88,171
Gross Balance, Ending Balance 105,436
Accumulated impairment losses 0
Net Balance, Ending Balance $ 105,436