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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Loss and Tax Credit Carryforwards [Line Items]          
Effective income tax rate     4.00% (7.50%) 40.60%
U.S. tax reform expense (benefit)   $ 10,100 $ (15,604) $ 10,138 $ 0
Goodwill impairment     46,051 14,731 0
Valuation allowance $ 50,000   50,005 4,523 $ 0
Provisional estimate related to deemed repatriation   27,700   27,700  
Net tax benefit related to U.S. tax reform     (5,500)    
Domestic operating loss carryforwards 193,900   193,900    
State operating loss carryforwards 6,200   6,200    
Operating loss carryforward subject to expiration 151,700   151,700    
Operating loss carryforwards not subject to expiration 48,400   48,400    
Foreign operating loss carryforwards 113,500   113,500    
Unrecognized tax benefits 13,254 14,768 13,254 14,768  
Decrease in unrecognized tax benefits is reasonably possible 2,600   2,600    
Accrued interest and penalties 300 $ 600 300 600  
Non-US          
Operating Loss and Tax Credit Carryforwards [Line Items]          
Valuation allowance     18,400    
U.S.          
Operating Loss and Tax Credit Carryforwards [Line Items]          
Valuation allowance 31,600        
Tax benefit from measurement of deferred tax liabilities       $ 17,600  
Subsea Technologies          
Operating Loss and Tax Credit Carryforwards [Line Items]          
Goodwill impairment     $ 46,100    
U.K. | Non-US          
Operating Loss and Tax Credit Carryforwards [Line Items]          
Valuation allowance 3,600        
Federal Ministry Of Finance, Germany And Inland Revenue Service, Singapore | Non-US          
Operating Loss and Tax Credit Carryforwards [Line Items]          
Valuation allowance $ 14,800