Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Assets:
Derivative financial instruments - interest rate swaps	$ 124	$ 3,011
Liabilities:
Derivative financial instruments - interest rate swaps	22,796	29
Debt	2,818,695	2,749,775
Fair Value, Measurements, Recurring | Carrying Amount
Assets:
Derivative financial instruments - interest rate swaps	124	3,011
Liabilities:
Derivative financial instruments - interest rate swaps	22,796	29
Debt	2,818,695	2,749,775
Fair Value, Measurements, Recurring | Fair Value | Level 2
Assets:
Derivative financial instruments - interest rate swaps	124	3,011
Liabilities:
Derivative financial instruments - interest rate swaps	22,796	29
Debt	$ 2,934,746	$ 2,826,983