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Income Taxes (Narrative) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating Loss Carryforwards [Line Items]        
Income taxes at The Netherlands statutory rate, rate   25.00% 25.00% 25.00%
Income tax (benefit) expense related to 2006 and 2004 Notes   $ (23,395,000) $ 6,401,000 $ 2,456,000
Unrecognized tax benefits, release   6,600,000    
Valuation allowance, deferred tax assets   5,511,000 3,703,000  
Increase (release) of valuation allowance, deferred tax asset   0    
Unrecognized tax benefit, net   18,300,000 16,700,000  
Unrecognized tax benefits that would impact effective tax rate   18,300,000 16,700,000  
Unrecognized tax benefits which may be realized   5,800,000    
Recognized interest (income) expense   100,000 300,000 (300,000)
Accrued interest included in accrued and other liabilities   1,500,000 1,400,000  
Deferred tax asset   27,763,000    
Deferred tax liability     36,969,000  
Total foreign net operating losses   380,700,000 264,200,000  
Valuation allowance amounts   1,800,000    
Earnings retained by subsidiaries and equity accounted investments   343,900,000    
Undistributed earnings not permanently reinvested   21,400,000 20,100,000  
Deferred tax liabilities on unremitted earnings of certain subsidiary   923,000 902,000  
Netherlands        
Operating Loss Carryforwards [Line Items]        
Income tax (benefit) expense related to 2006 and 2004 Notes       (2,600,000)
Internal Revenue Service (IRS)        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards   109,200,000 110,300,000  
Foreign Tax Authority        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards   271,500,000 $ 153,900,000  
Foreign Tax Authority | 2016 Acquisition        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards   41,900,000    
Foreign Tax Authority | Germany        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards   157,400,000    
Cash convertible notes        
Operating Loss Carryforwards [Line Items]        
Valuation allowance, deferred tax assets       $ 3,000,000
Increase (release) of valuation allowance, deferred tax asset $ (3,000,000)      
German Trade Tax | Foreign Tax Authority        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards   $ 56,400,000