Investments (Details 2) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Fair Value 12 months or less	$ 47,928	$ 123,737
Unrealized Losses 12 months or less	(491)	(3,332)
Fair Value Longer than 12 months	55,589	42,126
Unrealized Losses Longer than 12 months	(4,016)	(3,142)
Total Fair Value	103,517	165,863
Total Unrealized Losses	(4,507)	(6,474)
Equity Securities [Member]
Fair Value 12 months or less	1,085	4,748
Unrealized Losses 12 months or less	(40)	(323)
Fair Value Longer than 12 months	0	0
Unrealized Losses Longer than 12 months	0	0
Total Fair Value	1,085	4,748
Total Unrealized Losses	(40)	(323)
Debt Securities [Member]
Fair Value 12 months or less	46,843	118,989
Unrealized Losses 12 months or less	(451)	(3,009)
Fair Value Longer than 12 months	55,589	42,126
Unrealized Losses Longer than 12 months	(4,016)	(3,142)
Total Fair Value	102,432	161,115
Total Unrealized Losses	(4,467)	(6,151)
US Treasury Securities and Obligation [Member] | Debt Securities [Member]
Fair Value 12 months or less	0	0
Unrealized Losses 12 months or less	0	0
Fair Value Longer than 12 months	0	0
Unrealized Losses Longer than 12 months	0	0
Total Fair Value	0	0
Total Unrealized Losses	0	0
Corporate Bond Securities [Member] | Debt Securities [Member]
Fair Value 12 months or less	16,700	21,752
Unrealized Losses 12 months or less	(62)	(869)
Fair Value Longer than 12 months	6,767	2,366
Unrealized Losses Longer than 12 months	(902)	(786)
Total Fair Value	23,467	24,118
Total Unrealized Losses	(964)	(1,655)
Collateralized Corporate Bank Loans [Member] | Debt Securities [Member]
Fair Value 12 months or less	3,386	69,717
Unrealized Losses 12 months or less	(34)	(1,917)
Fair Value Longer than 12 months	16,109	19
Unrealized Losses Longer than 12 months	(619)	(3)
Total Fair Value	19,495	69,736
Total Unrealized Losses	(653)	(1,920)
Municipal Bonds [Member] | Debt Securities [Member]
Fair Value 12 months or less	26,349	26,780
Unrealized Losses 12 months or less	(346)	(196)
Fair Value Longer than 12 months	32,692	39,741
Unrealized Losses Longer than 12 months	(2,495)	(2,353)
Total Fair Value	59,041	66,521
Total Unrealized Losses	(2,841)	(2,549)
Collateralized Mortgage Backed Securities [Member] | Debt Securities [Member]
Fair Value 12 months or less	408	740
Unrealized Losses 12 months or less	(9)	(27)
Fair Value Longer than 12 months	21	0
Unrealized Losses Longer than 12 months	0	0
Total Fair Value	429	740
Total Unrealized Losses	(9)	(27)
Equity Securities Financial Services [Member] | Equity Securities [Member]
Fair Value 12 months or less	88	1,789
Unrealized Losses 12 months or less	(1)	(260)
Fair Value Longer than 12 months	0	0
Unrealized Losses Longer than 12 months	0	0
Total Fair Value	88	1,789
Total Unrealized Losses	(1)	(260)
Equity Securities, Other [Member] | Equity Securities [Member]
Fair Value 12 months or less	997	2,959
Unrealized Losses 12 months or less	(39)	(63)
Fair Value Longer than 12 months	0	0
Unrealized Losses Longer than 12 months	0	0
Total Fair Value	997	2,959
Total Unrealized Losses	$ (39)	$ (63)