Real Property Acquisitions and Development (Details 2) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Development projects:
Total development projects	$ 85,977	$ 187,004
Total construction in progress conversions	85,977	187,004
Triple Net [Member]
Development projects:
Total development projects	49,759	157,460
Seniors housing operating [Member]
Development projects:
Total development projects	36,218	3,634
Outpatient Medical [Member]
Development projects:
Total development projects	$ 0	$ 25,910