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Common Stock (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Share Repurchases of Common Stock
The Company made the following share repurchases during the years indicated:
  
 
 
Year Ended December 31,
 
 
2017
 
2016
 
2015
Aggregate purchase price
 
$
422,166

 
$
455,351

 
$
431,367

Number of shares repurchased
 
167

 
280

 
290