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Accumulated Other Comprehensive Loss (Amounts Reclassified out of AOCI) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Unrealized losses on available-for-sale securities:    
Interest expense $ 17,533 $ 11,621
Other income 1,036 679
Reclassification out of Accumulated Other Comprehensive Income [Member]    
Unrealized losses on available-for-sale securities:    
Total reclassified out of AOCL, before tax 1,821 2,604
Interest Rate Swap [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]    
Unrealized losses on available-for-sale securities:    
Equity in income of affiliated companies 1,640 $ 2,604
Interest expense 140  
Interest Rate Cap [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]    
Unrealized losses on available-for-sale securities:    
Interest expense $ 41