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Pension and Other Benefits (Details) - Component of Accumulated Other Comprehensive Loss have not been Recognized - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Component of Accumulated Other Comprehensive Loss have not been Recognized as a Component of Net Periodic Pension Expense [Abstract]    
Net actuarial loss recognized in accumulated other comprehensive income $ 6,272 $ 6,677