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Fair Values - Reconciliation of the Level 3 Inputs for Financial Instruments Measured on a Recurring Basis (Details) - Recurring basis - Level 3 - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Equity Securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 769 $ 776
Total Gains (Losses)    
Included in earnings - realized 0 0
Included in earnings - unrealized 0 0
Included in other comprehensive income 21 (7)
Purchases, sales, issuances and settlements, other, net 0 0
Re-evaluation of fair value swap   0
Ending balance 790 769
Fair Value Swap    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance (226) (226)
Total Gains (Losses)    
Included in earnings - realized 0 0
Included in earnings - unrealized 0 0
Purchases, sales, issuances and settlements, other, net 0 0
Re-evaluation of fair value swap   0
Ending Balance $ (226) $ (226)