Derivative Financial Instrument Interest Rate Swaps (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Derivative, Average Fixed Interest Rate	2.18%	2.18%
Derivative, Average Variable Interest Rate	0.38%	1.73%
Derivative, Average Remaining Maturity	4 years 4 months 24 days	5 years 4 months 24 days
Derivative, Gain (Loss) on Derivative, Net	$ (11,879)	$ (3,503)
Interest Rate Swap
Derivative [Line Items]
Restricted Cash	41,000	20,000
Interest Rate Swap
Derivative [Line Items]
Derivative, Notional Amount	$ 160,000	$ 160,000