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Fair Value of Financial Instruments (Reconciliation of Fair Valued Assets Measured on a Recurring Basis) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Collateralized debt obligations [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance $ 14,347 $ 20,230 $ 20,254 $ 22,211
Included in other comprehensive income 371 (303) (5,536) (2,284)
Ending Balance $ 14,718 19,927 $ 14,718 19,927
Interest Rate Swap [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance       (66)
Included in other comprehensive income       66
Ending balance   $ 0   $ 0