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Other Expenses, Net (Tables)
9 Months Ended
Sep. 30, 2015
Other Expenses, Net [Abstract]  
Schedule of other expenses, net
  

Three-Month Periods 
Ended September 30,

  

Nine-Month Periods 
Ended September 30,

 
  2015  2014  2015  2014 
Interest income $(4,461) $(3,912) $(10,634) $(11,607)
Interest expense  15,084   14,514   41,039   44,148 
Other  4,488   644   (3,346)  6,092 
Other expenses, net $15,111  $11,246  $27,059  $38,633