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Fair Value Of Financial Instruments (Schedule Of Changes In Fair Value Associated With Level 3 Financial Instruments) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Transfers, Into Level 3 $ 500  
Transfers, Out of Level 3 (3,000)  
Non-Agency [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 1,476 $ 806
Unrealized gains/(losses), Included in changes in net assets (18) (241)
Realized gains/(losses) 54 127
Redemptions (430) (332)
Transfers, Into Level 3   1,116
Net change (394) 670
Ending Balance 1,082 1,476
Corporate Fixed Income Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance   1,993
Unrealized gains/(losses), Included in changes in net assets   84
Realized gains/(losses)   53
Purchases 292 11,643
Sales   (13,773)
Redemptions (19)  
Net change 273 (1,993)
Ending Balance 273  
Equity Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 619 1,144
Unrealized gains/(losses), Included in changes in net assets (279)  
Purchases 253  
Sales   (525)
Transfers, Into Level 3 7  
Net change (19) (525)
Ending Balance 600 619
Corporate Equity Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 2,942 7,550
Unrealized gains/(losses), Included in changes in net assets (361) 1,410
Realized gains/(losses) 2,453  
Purchases 3,593  
Redemptions (4,794)  
Transfers, Into Level 3   182
Transfers, Out of Level 3   (6,200)
Net change 891 (4,608)
Ending Balance 3,833 2,942
Equity Auction Rate Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 50,442 46,197
Unrealized gains/(losses), Included in changes in net assets 547 (413)
Purchases 50 15,176
Redemptions (2,350) (5,250)
Transfers, Out of Level 3   (5,268)
Net change (1,753) 4,245
Ending Balance 48,689 50,442
Auction Rate Municipal Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 1,315 1,326
Unrealized gains/(losses), Included in changes in net assets 67 (11)
Redemptions (550)  
Net change (483) (11)
Ending Balance 832 1,315
Other Investment [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 20 2,026
Unrealized gains/(losses), Included in changes in net assets   (938)
Purchases 3,782  
Transfers, Into Level 3 465  
Transfers, Out of Level 3 (3,027) (1,068)
Net change 1,220 (2,006)
Ending Balance $ 1,240 20
Asset-Backed Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance   44,045
Unrealized gains/(losses), Included in OCI, Assets   342
Realized gains/(losses)   (2,136)
Sales   (42,251)
Net change   $ (44,045)