Quarterly report pursuant to Section 13 or 15(d)

Share Repurchase Program (Details)

v3.10.0.1
Share Repurchase Program (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Feb. 28, 2017
Jul. 05, 2017
Feb. 24, 2017
Number of shares repurchased (in shares) 461,358 13,657 858,393        
Share repurchase cost $ 21,907   $ 39,286        
Average price per share (in dollars per share) $ 47.48   $ 45.77        
2016 Repurchase program              
Number of shares repurchased (in shares)         788,399    
Share repurchase cost         $ 26,600    
Average price per share (in dollars per share)         $ 33.72    
2017 ASR Agreement              
Number of shares repurchased (in shares)       1,521,100      
Average price per share (in dollars per share)       $ 65.74      
Payment under ASR agreement           $ 100,000  
Initial number of shares delivered under ASR agreement (in shares)           1,500,000  
Initial percentage of shares delivered under ASR agreement           80.00%  
Maximum | 2017 Repurchase program              
Share repurchase program, authorized amount             $ 200,000