Investments (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Fair Value 12 months or less	$ 81,876	$ 123,737
Unrealized Losses 12 months or less	(1,047)	(3,332)
Fair Value Longer than 12 months	50,039	42,126
Unrealized Losses Longer than 12 months	(3,782)	(3,142)
Fair Value Total	131,915	165,863
Unrealized Losses Total	(4,829)	(6,474)
Equity Securities [Member]
Fair Value 12 months or less	3,363	4,748
Unrealized Losses 12 months or less	(515)	(323)
Fair Value Longer than 12 months	0	0
Unrealized Losses Longer than 12 months	0	0
Fair Value Total	3,363	4,748
Unrealized Losses Total	(515)	(323)
Debt Securities [Member]
Fair Value 12 months or less	78,513	118,989
Unrealized Losses 12 months or less	(532)	(3,009)
Fair Value Longer than 12 months	50,039	42,126
Unrealized Losses Longer than 12 months	(3,782)	(3,142)
Fair Value Total	128,552	161,115
Unrealized Losses Total	(4,314)	(6,151)
US Treasury Securities and Obligation [Member] | Debt Securities [Member]
Fair Value 12 months or less	23,998
Unrealized Losses 12 months or less	(3)
Fair Value Longer than 12 months	0
Unrealized Losses Longer than 12 months	0
Fair Value Total	23,998
Unrealized Losses Total	(3)
Corporate Bond Securities [Member] | Debt Securities [Member]
Fair Value 12 months or less	10,802	21,752
Unrealized Losses 12 months or less	(38)	(869)
Fair Value Longer than 12 months	6,910	2,366
Unrealized Losses Longer than 12 months	(725)	(786)
Fair Value Total	17,712	24,118
Unrealized Losses Total	(763)	(1,655)
Collateralized Corporate Bank Loans [Member] | Debt Securities [Member]
Fair Value 12 months or less	6,273	69,717
Unrealized Losses 12 months or less	(97)	(1,917)
Fair Value Longer than 12 months	14,236	19
Unrealized Losses Longer than 12 months	(646)	(3)
Fair Value Total	20,509	69,736
Unrealized Losses Total	(743)	(1,920)
Municipal Bonds [Member] | Debt Securities [Member]
Fair Value 12 months or less	30,073	26,780
Unrealized Losses 12 months or less	(362)	(196)
Fair Value Longer than 12 months	28,809	39,741
Unrealized Losses Longer than 12 months	(2,408)	(2,353)
Fair Value Total	58,882	66,521
Unrealized Losses Total	(2,770)	(2,549)
Collateralized Mortgage Backed Securities [Member] | Debt Securities [Member]
Fair Value 12 months or less	7,367	740
Unrealized Losses 12 months or less	(32)	(27)
Fair Value Longer than 12 months	84	0
Unrealized Losses Longer than 12 months	(3)	0
Fair Value Total	7,451	740
Unrealized Losses Total	(35)	(27)
Equity Securities Financial Services [Member] | Equity Securities [Member]
Fair Value 12 months or less	92	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
Fair Value Total	92	1,789
Unrealized Losses Total	(1)	(260)
Equity Securities, Other [Member] | Equity Securities [Member]
Fair Value 12 months or less	3,271	2,959
Unrealized Losses 12 months or less	(514)	(63)
Fair Value Longer than 12 months	0	0
Unrealized Losses Longer than 12 months	0	0
Fair Value Total	3,271	2,959
Unrealized Losses Total	$ (514)	$ (63)