Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Retirement Plans and Employee Rights Upon Termination (Narrative) (Details)

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Retirement Plans and Employee Rights Upon Termination (Narrative) (Details) - USD ($)
2 Months Ended 12 Months Ended
Mar. 03, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Retirement Plans and Employee Rights Upon Termination [Abstract]        
Severance liabilities   $ 3,800,000 $ 4,400,000  
Employee contribution percentage   50.00%    
Employer contributions matching amount $ 3,000 $ 3,000    
Percent of employee contribution matched by the Company 4.00% 3.00%    
Employer contribution amount   $ 4,200,000 $ 2,800,000 $ 1,100,000