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Goodwill and Intangible Assets (Schedule of Goodwill) (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill [Roll Forward]          
Goodwill beginning balance   $ 755,245,000 $ 755,245,000 $ 652,743,000  
Acquisitions, net of dispositions     22,312,000 155,080,000  
Impairment $ (298,800,000)   (298,789,000) (68,004,000) $ 0
Impact of non-U.S. local currency translation     (9,121,000) 15,426,000  
Goodwill ending balance 469,647,000   469,647,000 755,245,000 652,743,000
Operating Segments | Drilling & Downhole          
Goodwill [Roll Forward]          
Goodwill beginning balance   494,983,000 494,983,000 529,901,000  
Acquisitions, net of dispositions     1,753,000 19,571,000  
Impairment     (298,789,000) (68,004,000)  
Impact of non-U.S. local currency translation     (6,796,000) 13,515,000  
Goodwill ending balance 191,151,000   191,151,000 494,983,000 529,901,000
Operating Segments | Completions          
Goodwill [Roll Forward]          
Goodwill beginning balance   240,816,000 240,816,000 105,198,000  
Acquisitions, net of dispositions   20,559,000   133,914,000  
Impairment     0 0  
Impact of non-U.S. local currency translation     (2,095,000) 1,704,000  
Goodwill ending balance 259,280,000   259,280,000 240,816,000 105,198,000
Operating Segments | Production          
Goodwill [Roll Forward]          
Goodwill beginning balance   $ 19,446,000 19,446,000 17,644,000  
Acquisitions, net of dispositions     0 1,595,000  
Impairment     0 0  
Impact of non-U.S. local currency translation     (230,000) 207,000  
Goodwill ending balance $ 19,216,000   $ 19,216,000 $ 19,446,000 $ 17,644,000