Fair Value Measurements (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Changes in fair value of level 3 assets
Balance at beginning of period	$ 2,686	$ 2,295
Settlement	(1,863)	0
Sales		(283)
Gains and (losses)-unrealized	695	657
Gains and (losses)-realized	10	17
Transfers out of Level 3	(1,015)
Balance at end of period	513	2,686
Fixed Income Securities [Member]
Changes in fair value of level 3 assets
Balance at beginning of period	1,170	1,438
Sales		(283)
Gains and (losses)-unrealized	(1)	(2)
Gains and (losses)-realized	10	17
Transfers out of Level 3	(1,015)
Balance at end of period	164	1,170
Other Assets [Member]
Changes in fair value of level 3 assets
Balance at beginning of period	1,516	857
Settlement	(1,863)	0
Gains and (losses)-unrealized	696	659
Balance at end of period	349	1,516
Account payable and accrued liabilities - earnout liability [Member]
Changes in fair value of level 3 assets
Earnout liability	6,968
Gains and (losses)-unrealized	41
Balance at end of period	$ 7,009