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Accumulated Other Comprehensive (Loss) Income (Tables)
12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Accumulated Comprehensive (Loss) Income

   Foreign currency translation adjustment  Net prior service credit and actuarial losses  Total
Balances, December 31, 2015  $(1,582,632)  $(948,157)  $(2,530,790)
Change in net prior service credit               
   and actuarial losses, net of tax        284,145    284,145 
Translation adjustment   (89,556)        (89,556)
Balances, December 31, 2016  $(1,672,188)  $(664,012)  $(2,336,201)
Change in net prior service credit               
   and actuarial losses, net of tax        87,461    87,461 
Translation adjustment   614,741         614,741 
Balances, December 31, 2017  $(1,057,447)  $(576,551)  $(1,633,999)