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Other Expenses, Net (Tables)
3 Months Ended
Mar. 31, 2017
Other Expenses, Net [Abstract]  
Schedule of other expenses, net

  Three-Month Periods
Ended March 31,
 
  2017  2016 
Interest expense $39,902  $36,907 
Interest income  (5,957)  (13,335)
Other gains  (3,703)  (185)
Other expenses, net $30,242  $23,387