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Stockholders' Equity (Share Repurchase) (Details) - USD ($)
$ / shares in Units, shares in Thousands
3 Months Ended 6 Months Ended
Feb. 12, 2019
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Share Repurchase Program [Line Items]          
Stock repurchased and retired during period, shares   5,469      
Stock repurchase program, average price paid, per share   $ 19.56      
Stock repurchased and retired during period, value   $ 106,992,000 $ 30,004,000 $ 106,992,000 $ 81,000,000
2018 Share repurchase program [Member]          
Share Repurchase Program [Line Items]          
Stock repurchase program, authorized repurchase amount canceled $ 36,000,000.0        
2019 Share repurchase program [Member]          
Share Repurchase Program [Line Items]          
Stock repurchase program, authorized amount $ 150,000,000.0        
Stock repurchase program, remaining number of shares authorized to be repurchased   43,000   43,000