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Stockholders' Equity (Schedule of Changes in Accumulated Other Comprehensive Income by Component) (Details) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 28, 2020 | Jun. 30, 2019
Estimated tax benefit (provision) |  |
Beginning balance | $ 1 | $ 11
Other comprehensive income (loss) before reclassifications | (196) | (187)
Less: Amount reclassified from accumulated other comprehensive income | (197) | (177)
Net current period other comprehensive income (loss) | 1 | (10)
Ending balance | 2 | 1
AOCI, after tax |  |
Beginning balance | 608,693 | 627,552
Other comprehensive income (loss) before reclassifications | 726 | 692
Less: Amount reclassified from accumulated other comprehensive income | 740 | 665
Net current period other comprehensive income (loss) | (14) | 27
Ending balance | 606,146 | 622,072
Unrealized gains (losses) on available-for-sale investments |  |
AOCI, before tax |  |
Beginning balance | (2) | (18)
Other comprehensive income (loss) before reclassifications | 0 | 16
Less: Amount reclassified from accumulated other comprehensive income | 0 | 0
Net current period other comprehensive income (loss) | 0 | 16
Ending balance | (2) | (2)
Unrealized gains (losses) on derivatives |  |
AOCI, before tax |  |
Beginning balance | 22 | (8)
Other comprehensive income (loss) before reclassifications | 922 | 863
Less: Amount reclassified from accumulated other comprehensive income | 937 | 842
Net current period other comprehensive income (loss) | (15) | 21
Ending balance | 7 | 13
AOCI |  |
AOCI, after tax |  |
Beginning balance | 21 | (15)
Ending balance | $ 7 | $ 12

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