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Fair Value of FInancial Instruments (Other Investments - Lifeshield) (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Feb. 28, 2019
Mar. 31, 2019
Mar. 31, 2018
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]      
Other investment, proceeds   $ 10,413 $ 5,415
Lifeshield [Member]      
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]      
Fair value investment, carrying amount   $ 10,000  
Fair value investment, ownership percentage   40.00%  
Other investment, proceeds $ 11,000