Investments in Debt and Equity Securities (Details 1) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Gross unrealized gains and losses
Gross unrealized gains	$ 19,225	$ 14,463
Gross unrealized losses	564	3,030
Municipal [Member]
Gross unrealized gains and losses
Gross unrealized gains	934	1,080
Gross unrealized losses	0	0
Corporate and utilities [Member]
Gross unrealized gains and losses
Gross unrealized gains	13,845	9,184
Gross unrealized losses	244	2,973
Foreign [Member]
Gross unrealized gains and losses
Gross unrealized gains	1,930	1,937
Gross unrealized losses	164	53
U.S. Government [Member]
Gross unrealized gains and losses
Gross unrealized gains	1,592	1,820
Gross unrealized losses	0	0
Equity securities [Member]
Gross unrealized gains and losses
Gross unrealized gains	924	442
Gross unrealized losses	$ 156	$ 4