Fair Value of Financial Instruments - Assets and Liabilities at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Liabilities:
Debt	$ 2,749,775	$ 2,541,232
Fair Value, Measurements, Recurring | Carrying Amount | Fair Value, Inputs, Level 2
Assets:
Derivative financial instruments, asset	3,011	1,111
Liabilities:
Derivative financial instrument, liability	29	0
Debt	2,749,775	2,541,232
Fair Value, Measurements, Recurring | Fair Value | Fair Value, Inputs, Level 2
Assets:
Derivative financial instruments, asset	3,011	1,111
Liabilities:
Derivative financial instrument, liability	29	0
Debt	$ 2,826,983	$ 2,508,599