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Fair Value Of Financial Instruments (Schedule Of Changes In Fair Value Carrying Values Associated With Level 3 Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Corporate Fixed Income Securities [Member]
   
Beginning Balance $ 3,742 $ 40,243
Unrealized gains/(losses), Included in changes in net assets 42 (288)
Realized gains/(losses), Assets 282 371
Purchases, Assets 27,337 169,152
Sales, Assets (25,663) (198,636)
Redemptions, Assets (443) (871)
Transfers, Into Level 3, Assets 2,687 35
Transfers, Out of Level 3, Assets (7,401) (6,264)
Net change, Assets (3,159) (36,501)
Ending Balance, Assets 583 3,742
State And Municipal Securities [Member]
   
Beginning Balance 66,896 11,436
Unrealized gains/(losses), Included in OCI, Assets (1,779) 3,085
Realized gains/(losses), Assets 230 881
Purchases, Assets 47,840 48,974
Sales, Assets   (24,126)
Redemptions, Assets (22,700) (1,125)
Transfers, Into Level 3, Assets   27,854
Transfers, Out of Level 3, Assets   (83)
Net change, Assets 23,591 55,460
Ending Balance, Assets 90,487 66,896
Available-For-Sale Securities [Member]
   
Beginning Balance 12,000  
Purchases, Assets   12,000
Redemptions, Assets (12,000)  
Net change, Assets (12,000) 12,000
Ending Balance, Assets   12,000
Equity Auction Rate Securities [Member]
   
Beginning Balance 103,176 76,826
Unrealized gains/(losses), Included in changes in net assets 21 (600)
Purchases, Assets 3,400 45,625
Redemptions, Assets (42,200) (18,675)
Net change, Assets (38,779) 26,350
Ending Balance, Assets 64,397 103,176
Municipal Auction Rate Securities [Member]
   
Beginning Balance 11,729 6,533
Unrealized gains/(losses), Included in changes in net assets (207) (189)
Purchases, Assets 6,750 10,135
Sales, Assets   (2,900)
Redemptions, Assets (4,205) (1,850)
Net change, Assets 2,338 5,196
Ending Balance, Assets 14,067 11,729
Other Invesment [Member]
   
Beginning Balance 37,033 38,502
Unrealized gains/(losses), Included in changes in net assets 2,290 4,078
Realized gains/(losses), Assets 2,267 (1,126)
Purchases, Assets 1,672 1,776
Sales, Assets (5,965)  
Redemptions, Assets   (6,437)
Transfers, Into Level 3, Assets   240
Net change, Assets 264 (1,469)
Ending Balance, Assets 37,297 37,033
Corporate Fixed Income Securities 2 [Member]
   
Beginning Balance   4,685
Realized gains/(losses), Assets   (52)
Purchases, Assets   6,663
Sales, Assets   (11,296)
Net change, Assets   $ (4,685)