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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Income Taxes [Line Items]    
Net deferred tax asset $ 68,580 $ 65,420
Current deferred tax assets 0 12,051
Non-current deferred tax assets 70,446 63,321
Current deferred tax liabilities 0 1,728
Non-current deferred tax liabilities 1,866 8,224
Temporary differences related to investments in foreign subsidiaries 123,494  
Gross unrecognized tax benefits 19 63
Current Assets [Member]    
Income Taxes [Line Items]    
Current deferred tax assets   12,051
Non-current Assets [Member]    
Income Taxes [Line Items]    
Non-current deferred tax assets   63,321
Non-current deferred tax assets 70,446  
Current Liabilities [Member]    
Income Taxes [Line Items]    
Current deferred tax liabilities   1,728
Non-current Liabilities [Member]    
Income Taxes [Line Items]    
Non-current deferred tax liabilities 1,866  
Non-current deferred tax liabilities   $ 8,224
Tax Year 2010 and 2011 [Member]    
Income Taxes [Line Items]    
Estimate of possible loss $ 20,000