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Comprehensive Income (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax $ 52 $ 163 $ 154 $ 490