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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance $ 259,218 $ 609,305 $ 279,816 $ 741,557
Holding (losses) gains associated with marketable securities arising during period, net of tax 823 344 275 953
Ending balance 249,322 493,751 249,322 493,751
Accumulated Other Comprehensive Loss        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (3,787) (3,376) (3,239) (3,985)
Ending balance $ (2,964) $ (3,032) $ (2,964) $ (3,032)