Fair Value Measurements and Disclosures (Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation) (Details) (Significant unobservable inputs (Level 3) [Member], USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Significant unobservable inputs (Level 3) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of period	$ 1,929
Settlements	(121)
Total realized/unrealized gains (losses): Included in other comprehensive income	153
Balance, end of period	$ 1,961