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Fair Value Measurements - Rollforward of Level 3 Assets (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Amortization $ 0 $ 0
Municipal bonds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 1,166 1,178
Purchases, issuances, and settlements 0 0
Total gains included in other comprehensive income 43 17
Ending Balance $ 1,209 $ 1,195