Fair Value Measurements (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Changes in fair value of level 3 assets
Balance at beginning of period	$ 513	$ 2,686
Purchases	9,430
Other comprehensive income	15	2
Net earnings	116	215
Transfers out of Level 3		(1,015)
Balance at end of period	10,074	1,888
Fixed Income Securities [Member]
Changes in fair value of level 3 assets
Balance at beginning of period	164	1,170
Purchases	9,430
Other comprehensive income	15	2
Net earnings	6
Transfers out of Level 3		(1,015)
Balance at end of period	9,615	157
Other Assets [Member]
Changes in fair value of level 3 assets
Balance at beginning of period	349	1,516
Net earnings	110	215
Balance at end of period	459	1,731
Earn Out Liability [Member]
Changes in fair value of level 3 assets
Balance at beginning of period	7,009
Net earnings	62
Balance at end of period	$ 7,071