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Fair Value Measurements - Rollforward of Level 3 Assets (Details) - Municipal bonds - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance $ 1,166 $ 1,178
Total gains or (losses) included in other comprehensive income 68 (32)
Ending Balance $ 1,234 $ 1,146