Annual report pursuant to Section 13 and 15(d)

Income Taxes (Narrative) (Details)

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Income Taxes (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Change in Unrecognized Tax Benefit Reasonably Possible, Low Range $ 0    
Change in Unrecognized Tax Benefit Reasonably Possible, High Range 6,083,000    
Net operating loss carryforwards $ 12,159,000 $ 51,965,000  
Net operating loss carryforwards, expiration year Jan. 01, 2026    
Deferred tax assets, net operating loss carryforwards $ 2,971,000 6,660,000  
Operating loss carryforward, valuation allowance   5,707,000  
Undistributed earnings of foreign subsidiaries 360,295,000    
Unrecognized deferred tax liability associated with undistributed earnings 75,022,000    
Unrecognized tax benefits that would affect the effective tax rate 9,358,000 5,139,000  
Interest expense and penalties recognized (reversed) (356,000) (65,000) $ (253,000)
Accrued interest and penalties related to uncertain tax positions $ 2,402,000 $ 2,758,000