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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Weighted Average Shares Outstanding

  
Three months ended June 30,
  
Six months ended June 30,
 
  
2017
  
2016
  
2017
  
2016
 
Basic shares outstanding
  
102,081
   
101,249
   
101,983
   
101,160
 
Effect of potential common stock:
                
Common stock awards
  
1,328
   
1,143
   
1,264
   
1,142
 
Senior subordinated convertible notes
  
-
   
74
   
-
   
74
 
Diluted shares outstanding
  
103,409
   
102,466
   
103,247
   
102,376