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Investments - Schedule of Depreciation Expense Related to Investment Real Estate (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Real Estate [Line Items]      
Depreciation $ 4,820 $ 4,058 $ 3,242
Real Estate Investment      
Real Estate [Line Items]      
Depreciation $ 410 $ 179 $ 178