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Stockholders' Equity (Schedule of Changes in Accumulated Other Comprehensive Income by Component) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Estimated tax benefit (provision)    
Beginning balance $ 11 $ 133
Other comprehensive income (loss) before reclassifications (187) 31
Less: Amount reclassified from accumulated other comprehensive income (177) 134
Net current period other comprehensive income (loss) (10) (103)
Ending balance 1 30
AOCI, after tax    
Beginning balance 627,552 730,485
Other comprehensive income (loss) before reclassifications 692 242
Amount reclassified from accumulated other comprehensive income, Net of tax 665 (502)
Less: Amount reclassified from accumulated other comprehensive income 27 744
Ending balance 622,072  
Unrealized gains (losses) on available-for-sale investments    
AOCI, before tax    
Beginning balance (18) (146)
Other comprehensive income (loss) before reclassifications 16 31
Less: Amount reclassified from accumulated other comprehensive income 0 0
Net current period other comprehensive income (loss) 16 31
Ending balance (2) (115)
Unrealized gains (losses) on derivatives    
AOCI, before tax    
Beginning balance (8) (838)
Other comprehensive income (loss) before reclassifications 863 180
Less: Amount reclassified from accumulated other comprehensive income 842 (636)
Net current period other comprehensive income (loss) 21 816
Ending balance 13 (22)
Total    
AOCI, after tax    
Beginning balance (15) (851)
Ending balance $ 12 $ (107)