Investments (Fair Value and Losses by Length of Time in a Continuous Unrealized Loss Position) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Duration Of Unrealized Losses On Equity Securities [Line Items]
Twelve months or more Gross Unrealized Losses	$ 10,000	$ 7,000
Equity Securities [Member]
Duration Of Unrealized Losses On Equity Securities [Line Items]
Less than twelve months Fair Value	76	54
Less than twelve months Gross Unrealized Losses	6	9
Twelve months or more Fair Value	0	0
Twelve months or more Gross Unrealized Losses	0	0
Total Fair Value	76	54
Total Gross Unrealized Losses	$ 6	$ 9