Fair Value of Financial Instruments (Level 3 Securities) (Details) (Recurring [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012		Jun. 30, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 25,582		$ 25,842
Realized gains	646	[1]	646	[1]
Unrealized losses	(408)	[1]	(368)	[1]
Purchases	179		179
Disposals	(3,879)		(4,179)
Ending Balance	22,120		22,120
States, Municipalities and Political Subdivisions [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	880		880
Realized gains	0	[1]	0	[1]
Unrealized losses	0	[1]	0	[1]
Purchases	0		0
Disposals	(65)		(65)
Ending Balance	815		815
Foreign Bonds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	836		836
Realized gains	0	[1]	0	[1]
Unrealized losses	0	[1]	0	[1]
Purchases	0		0
Disposals	0		0
Ending Balance	836		836
Corporate Bonds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	20,075		20,285
Realized gains	646	[1]	646	[1]
Unrealized losses	(408)	[1]	(368)	[1]
Purchases	0		0
Disposals	(3,814)		(4,064)
Ending Balance	16,499		16,499
Asset-Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	315		315
Realized gains	0	[1]	0	[1]
Unrealized losses	0	[1]	0	[1]
Purchases	0		0
Disposals	0		0
Ending Balance	315		315
Equities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	3,476		3,526
Realized gains	0	[1]	0	[1]
Unrealized losses	0	[1]	0	[1]
Purchases	179		179
Disposals	0		(50)
Ending Balance	$ 3,655		$ 3,655

[1] Realized gains (losses) are recorded as a component of earnings whereas unrealized gains (losses) are recorded as a component of comprehensive income.