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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
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2011
Corporate Fixed Income Securities [Member]
   
Beginning Balance $ 14,555 [1] $ 40,243 [1]
Unrealized gains/(losses), Included in changes in net assets 102 [1],[2] (320) [1],[2]
Unrealized gains/(losses), Included in OCI, Assets 0 [1],[3] 0 [1],[3]
Realized gains/(losses), Assets 26 [1],[2] 736 [1],[2]
Purchases, Assets 27,061 [1] 166,483 [1]
Sales, Assets (22,709) [1] (182,072) [1]
Redemptions, Assets (523) [1] (716) [1]
Transfers, Into Level 3, Assets 0 [1] 0 [1]
Transfers, Out of Level 3, Assets (170) [1] (6,012) [1]
Net change, Assets 3,787 [1] (21,901) [1]
Ending Balance, Assets 18,342 [1] 18,342 [1]
Beginning Balance, Liabilities   [4] 4,685 [4]
Unrealized gains/(losses), Included in changes in net liabilities   [2],[4] 0 [2],[4]
Unrealized gains/(losses), Included in OCI, Liabilities   [3],[4] 0 [3],[4]
Realized gains/(losses), Liabilities   [2],[4] (36) [2],[4]
Purchases, Liabilities 2,435 [4] 6,663 [4]
Sales, Liabilities   [4] (8,877) [4]
Redemptions, Liabilities   [4] 0 [4]
Transfers, Into Level 3, Liabilities   [4] 0 [4]
Transfers, Out of Level 3, Liabilities   [4] 0 [4]
Net change, Liabilities 2,435 [4] (2,250) [4]
Liabilities, Ending Balance 2,435 [4] 2,435 [4]
State and Municipal Securities [Member]
   
Beginning Balance 24,297 [5] 11,436 [5]
Unrealized gains/(losses), Included in changes in net assets 2,087 [2],[5] 2,087 [2],[5]
Unrealized gains/(losses), Included in OCI, Assets 879 [3],[5] 815 [3],[5]
Realized gains/(losses), Assets 0 [2],[5] 0 [2],[5]
Purchases, Assets 13,987 [5] 26,987 [5]
Sales, Assets (24,126) [5] (24,126) [5]
Redemptions, Assets (300) [5] (375) [5]
Transfers, Into Level 3, Assets 27,854 [5] 27,854 [5]
Transfers, Out of Level 3, Assets 0 [5] 0 [5]
Net change, Assets 20,381 [5] 33,242 [5]
Ending Balance, Assets 44,678 [5] 44,678 [5]
Auction Rate Securities [Member]
   
Beginning Balance 72,204 76,826
Unrealized gains/(losses), Included in changes in net assets 437 [2] 290 [2]
Unrealized gains/(losses), Included in OCI, Assets 0 [3] 0 [3]
Realized gains/(losses), Assets 0 [2] 0 [2]
Purchases, Assets 1,875 2,075
Sales, Assets 0 0
Redemptions, Assets (7,900) (12,575)
Transfers, Into Level 3, Assets 0 0
Transfers, Out of Level 3, Assets 0 0
Net change, Assets (5,588) (10,210)
Ending Balance, Assets 66,616 66,616
Municipal Auction Rate Securities [Member]
   
Beginning Balance 8,471 6,533
Unrealized gains/(losses), Included in changes in net assets 71 [2] (96) [2]
Unrealized gains/(losses), Included in OCI, Assets 0 [3] 0 [3]
Realized gains/(losses), Assets 0 [2] 0 [2]
Purchases, Assets 1,675 4,105
Sales, Assets (2,900) (2,900)
Redemptions, Assets (200) (525)
Transfers, Into Level 3, Assets 0 0
Transfers, Out of Level 3, Assets 0 0
Net change, Assets (1,354) 584
Ending Balance, Assets 7,117 7,117
Other [Member]
   
Beginning Balance 38,606 38,502
Unrealized gains/(losses), Included in changes in net assets 1,418 [2] 3,564 [2]
Unrealized gains/(losses), Included in OCI, Assets 0 [3] 0 [3]
Realized gains/(losses), Assets (399) [2] (587) [2]
Purchases, Assets 131 824
Sales, Assets 0 0
Redemptions, Assets (1,038) (3,585)
Transfers, Into Level 3, Assets 240 240
Transfers, Out of Level 3, Assets 0 0
Net change, Assets 352  
Ending Balance, Assets 38,958 38,958
Net change, Liabilities   $ 456
[1] Included in trading securities owned in the consolidated statements of financial condition.
[2] Realized and unrealized gains/(losses) related to trading securities and investments are reported in other income in the consolidated statements of operations.
[3] Unrealized gains related to available-for-sale securities are reported in accumulated other comprehensive income in the consolidated statements of financial condition.
[4] Included in trading securities sold, but not yet purchased in the consolidated statements of financial condition.
[5] Included in available-for-sale securities in the consolidated statements of financial condition.