Commitments and Contingencies - Construction Commitments (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Construction Commitment [Line Items]
Total construction commitments	$ 339,665
Atlanta, GA
Construction Commitment [Line Items]
Total construction commitments	66,554
Plainville, CT
Construction Commitment [Line Items]
Total construction commitments	86,681
Lancaster, PA
Construction Commitment [Line Items]
Total construction commitments	80,500
Russellville, AR
Construction Commitment [Line Items]
Total construction commitments	71,375
Auckland, New Zealand
Construction Commitment [Line Items]
Total construction commitments	24,827
Calgary
Construction Commitment [Line Items]
Total construction commitments	$ 9,728