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Commitments	12 Months Ended
Commitments	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments	Commitments The Operating Partnership is committed to various non-cancelable operating leases for land, buildings and equipment. Total minimum rental payments for operating leases are insignificant for 2018 and all subsequent years. Rent expense under non-cancelable operating leases for the years ended December 31, 2017, 2016 and 2015 was insignificant.