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Fair Value Measurements - Rollforward of Level 3 Assets (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings $ 0
Municipal bonds
 
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Beginning Balance, January 1, 2013 0
Purchases, issuances, and settlements 1,200
Total gains or (losses) included in Other Comprehensive Income 6
Balance, end of period $ 1,206