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Stockholders' Equity (Share Repurchase) (Details) - USD ($) $ / shares in Units, shares in Thousands		3 Months Ended		9 Months Ended
	Feb. 12, 2019	Jun. 30, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 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	$ 17,968,000	$ 106,992,000	$ 98,968,000
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 authorized repurchase amount				$ 43,000,000.0

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Amount of a stock repurchase plan authorization canceled by the Board of Directors.

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Number of shares that have been repurchased and retired during the period.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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