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FAIR VALUE (Amount of Activity Pertaining to Level 3 Assets and Liabilities Included in Earnings) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Bonds        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Change in unrealized (losses) gains related to assets and liabilities held       $ (6)
Additional realized gains recognized $ 20,693   $ 24,264  
Total net (losses) gains reported in earnings 20,693   24,264 (6)
Derivatives        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Change in unrealized (losses) gains related to assets and liabilities held (42) $ 501   402
Change in unrealized losses related to assets and liabilities settled during the period     (195)  
Additional realized gains recognized 4 591 152 1,236
Total net (losses) gains reported in earnings $ (38) $ 1,092 $ (43) $ 1,638