Investments (Fair Value and Losses by Length of Time in a Continuous Unrealized Loss Position) (Details) (Equity Securities [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Equity Securities [Member]
Duration Of Unrealized Losses On Equity Securities [Line Items]
Less than twelve months Fair Value	$ 0	$ 0
Less than twelve months Gross Unrealized Losses	0	0
Twelve months or more Fair Value	0	0
Twelve months or more Gross Unrealized Losses	0	0
Total Fair Value	0	0
Total Gross Unrealized Losses	$ 0	$ 0