Investments in Debt and Equity Securities (Details 1) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Gross unrealized gains and losses
Gross unrealized gains	$ 24,721	$ 14,463
Gross unrealized losses	582	3,030
Municipal [Member]
Gross unrealized gains and losses
Gross unrealized gains	998	1,080
Gross unrealized losses	9
Corporate and utilities [Member]
Gross unrealized gains and losses
Gross unrealized gains	18,924	9,184
Gross unrealized losses	1	2,973
Foreign [Member]
Gross unrealized gains and losses
Gross unrealized gains	1,494	1,937
Gross unrealized losses	302	53
U.S. Government [Member]
Gross unrealized gains and losses
Gross unrealized gains	1,526	1,820
Equity securities [Member]
Gross unrealized gains and losses
Gross unrealized gains	1,779	442
Gross unrealized losses	$ 270	$ 4