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Acquisitions & Dispositions (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 20, 2021
Dec. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Business Acquisition [Line Items]        
Payments to acquire productive assets     $ 2,399 $ 2,246
Gain on contribution of subsea rentals business     0 88,375
Assets   $ 791,336 $ 791,336 889,926
Hawker Equipment Solutions, LLC        
Business Acquisition [Line Items]        
Cash consideration $ 5,100      
Payments to acquire productive assets   $ 3,400    
Term of expected payment 5 years      
ABZ and Quadrant Valves | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations        
Business Acquisition [Line Items]        
Consideration for disposal group       104,600
Assets       15,000
Accrued liabilities       $ 1,200