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Treasury Stock (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Treasury Stock
Repurchased shares of our common stock were as follows:
 
Year Ended December 31,
(In thousands)
2017
 
2016
 
2015
Shares repurchased
680

 
198

 
1,817

Cost of shares repurchased
$
39,085

 
$
12,647

 
$
89,395