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Stockholders' Equity (Schedule Of Changes in Accumulated Other Comprehensive Income by Component Net of Tax) (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss), Tax [Roll Froward]      
AOCI tax, beginning balance $ 133,000 $ (261,000) $ 24,000
Other comprehensive income (loss) before reclassifications (249,000) 3,062,000 (572,000)
Less: Amount reclassified from accumulated other comprehensive income (123,000) 2,668,000 (287,000)
Net current period other comprehensive income (loss) (126,000) 394,000 (285,000)
Distribution of Arlo 4,000    
AOCI tax, ending balance 11,000 133,000 (261,000)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (851,000)    
Beginning balance 730,485,000 796,819,000 708,710,000
Other comprehensive income (loss) before reclassifications 1,301,000 (7,745,000) 2,468,000
Less: Amount reclassified from accumulated other comprehensive income 465,000 (4,956,000) 533,000
Net current period other comprehensive income (loss) 836,000 (2,789,000) 1,935,000
Distribution of Arlo 0    
Ending balance (15,000) (851,000)  
Ending balance 627,552,000 730,485,000 796,819,000
Unrealized gains (losses) on available-for-sale securities      
Accumulated Other Comprehensive Income (Loss), Before Tax [Roll Forward]      
AOCI before tax, beginning (146,000) (31,000) (64,000)
Other comprehensive income (loss) before reclassifications 128,000 (115,000) 33,000
Less: Amount reclassified from accumulated other comprehensive income 0 0 0
Net current period other comprehensive income (loss) 128,000 (115,000) 33,000
Distribution of Arlo 0    
AOCI before tax, ending (18,000) (146,000) (31,000)
Unrealized gains (losses) on derivatives      
Accumulated Other Comprehensive Income (Loss), Before Tax [Roll Forward]      
AOCI before tax, beginning (838,000) 2,230,000 43,000
Other comprehensive income (loss) before reclassifications 1,422,000 (10,692,000) 3,007,000
Less: Amount reclassified from accumulated other comprehensive income 588,000 (7,624,000) 820,000
Net current period other comprehensive income (loss) 834,000 (3,068,000) 2,187,000
Distribution of Arlo (4,000)    
AOCI before tax, ending (8,000) (838,000) 2,230,000
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance   1,938,000 3,000
Beginning balance (851,000) 1,938,000 3,000
Ending balance     1,938,000
Ending balance $ (15,000) $ (851,000) $ 1,938,000