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Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Schedule of Reconciliation of Shares Used in Calculating Earnings Per Basic and Diluted Shares
A reconciliation of shares used in calculating earnings per basic and diluted shares follows (in thousands):
 
Three Months Ended
 June 30,
 
Six Months Ended
 June 30,
 
2018
 
2017
 
2018
 
2017
Weighted average common shares outstanding—basic
26,150

 
25,983

 
26,103

 
25,930

Dilutive effect of stock-based awards
259

 
160

 
310

 
186

Dilutive effect of convertible senior notes

 
248

 

 
124

Weighted average common shares outstanding—diluted
26,409

 
26,391

 
26,413

 
26,240