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Fair Value of Financial Instruments (Details 3) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Reconciliation of the beginning and ending balance of assets measured at fair value on a recurring basis using significant unobservable (Level 3) inputs  
Balance, beginning of period $ 952
Total gains or (losses) realized/unrealized: Included in earnings (or changes in net assets) (30)
Total gains or (losses) realized/unrealized: Included in other comprehensive income 117
Total gains or (losses) realized/unrealized: Purchases, issuances, and settlements (55)
Balance, end of period $ 984