Variable Interest Entities ("VIEs") (Comparison of Liability to Maximum Exposure to Loss) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Variable Interest Entity [Line Items]
Other Liabilities	$ 1,893	$ 2,442
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Other Liabilities	349
Maximum Exposure to Loss	$ 216,080