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Income Taxes - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]            
Discrete tax expense (benefit) due to Tax Reform Legislation $ (5,800,000) $ 28,200,000 $ (5,800,000) $ 28,200,000    
Income tax expense related to transition tax   41,400,000   41,400,000    
Tax benefit related to the remeasurement of net deferred tax liabilities       13,200,000    
Expected proceeds from prior period income taxes     5,500,000      
Discrete tax charges         $ 1,000,000  
Operating Loss Carryforwards [Line Items]            
Valuation allowance   37,904,000 33,762,000 37,904,000    
Foreign tax credit carryforwards   27,009,000 19,836,000 27,009,000    
Undistributed earnings of foreign subsidiaries           $ 240,000,000
Foreign earnings repatriated     45,000,000      
Unrecognized tax benefits   0 0 0    
Income tax penalties and interest accrued   0 0 0    
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]            
Operating Loss Carryforwards [Line Items]            
Operating loss carryforwards     157,700,000      
State and Local Jurisdiction [Member]            
Operating Loss Carryforwards [Line Items]            
Operating loss carryforwards     117,300,000      
Foreign Tax Authority [Member]            
Operating Loss Carryforwards [Line Items]            
Operating loss carryforwards     33,700,000      
Operating loss carryforwards without expiration     16,400,000      
Net Operating Loss Carryforward [Member]            
Operating Loss Carryforwards [Line Items]            
Valuation allowance   $ 10,900,000 13,900,000 $ 10,900,000    
GEODynamics, Inc. [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]            
Operating Loss Carryforwards [Line Items]            
Operating loss carryforwards     106,000,000      
GEODynamics, Inc. [Member] | State and Local Jurisdiction [Member]            
Operating Loss Carryforwards [Line Items]            
Operating loss carryforwards     $ 18,800,000