Commitments and Contingencies - Construction Commitments (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Construction Commitment [Line Items]
Total construction commitments	$ 57,974
Q1 2020 | Columbus, OH
Construction Commitment [Line Items]
Total construction commitments	241
Q2 2020 | Savannah, GA
Construction Commitment [Line Items]
Total construction commitments	13,692
Q2 2021 | Atlanta, GA
Construction Commitment [Line Items]
Total construction commitments	$ 44,041