Derivative Financial Instruments - FV on Recurring Basis (Details) - Interest Rate Swaps - Fair value on recurring basis - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Assets (liabilities):
Interest rate swaps-Asset	$ 0	$ 303
Interest rate swaps-Liability	(50,731)	(18,819)
Level 1
Assets (liabilities):
Interest rate swaps-Asset	0	0
Interest rate swaps-Liability	0	0
Level 2
Assets (liabilities):
Interest rate swaps-Asset	0	303
Interest rate swaps-Liability	(50,731)	(18,819)
Level 3
Assets (liabilities):
Interest rate swaps-Asset	0	0
Interest rate swaps-Liability	$ 0	$ 0