Stockholders' Equity (Schedule of Changes in Accumulated Other Comprehensive Income by Component) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017
Estimated tax benefit (provision)
Beginning balance	$ 133	$ (261)
Other comprehensive income (loss) before reclassifications	(165)	2,038
Less: Amount reclassified from accumulated other comprehensive income	(44)	1,019
Net current period other comprehensive income (loss)	(121)	1,019
Ending balance	12	758
AOCI, after tax
Beginning balance	730,485
Other comprehensive income (loss) before reclassifications	982	(8,593)
Amount reclassified from accumulated other comprehensive income, Net of tax	167	(1,893)
Less: Amount reclassified from accumulated other comprehensive income	815	(6,700)
Ending balance	910,178
Unrealized gains (losses) on available-for-sale securities
AOCI, before tax
Beginning balance	(146)	(31)
Other comprehensive income (loss) before reclassifications	72	(41)
Less: Amount reclassified from accumulated other comprehensive income	0	0
Net current period other comprehensive income (loss)	72	(41)
Ending balance	(74)	(72)
Unrealized gains (losses) on derivatives
AOCI, before tax
Beginning balance	(838)	2,230
Other comprehensive income (loss) before reclassifications	1,075	(10,590)
Less: Amount reclassified from accumulated other comprehensive income	211	(2,912)
Net current period other comprehensive income (loss)	864	(7,678)
Ending balance	26	(5,448)
Accumulated Other Comprehensive Income (Loss)
AOCI, after tax
Beginning balance	(851)	1,938
Ending balance	$ (36)	$ (4,762)