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Recent Accounting Pronouncements (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Amount of restricted cash in prepaid expenses and other assets $ 0 $ 4,674,000
Accounting Standards Update 2018-02    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Reclassification of stranded tax effects $ 101,000,000