Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Jun. 06, 2019
Debt [Roll Forward]
Total debt, Beginning balance	$ 6,087,922
Debt Issuances, Net	1,056,720
Repayments, Extinguishment and Assumptions, Net	(1,514,701)
Accretion and Amortization, Net	3,273
Total debt, Ending balance	5,633,214
Mortgages [Member]
Debt [Roll Forward]
Outstanding balance, Beginning balance	1,917,132
Net premiums (discount), Beginning balance	16,077
Deferred costs, Beginning balance	(10,552)
Total debt, Beginning balance	1,922,657
Repayments, Extinguishment and Assumptions	(200,933)
Repayments, Extinguishment and Assumptions of Debt, Premium	107
Repayments, Extinguishment and Assumptions of Debt, Deferred costs	125
Repayments, Extinguishment and Assumptions, Net	(200,701)
Accretion and Amortization	(5,763)
Accretion and Amortization, Deferred costs	1,624
Accretion and Amortization, Net	(4,139)
Outstanding balance, Ending balance	1,716,199
Net premiums (discount), Ending balance	10,421
Deferred costs, Ending balance	(8,803)
Total debt, Ending balance	1,717,817
Mortgage note in default		$ 19,500
Corporate Bonds [Member]
Debt [Roll Forward]
Outstanding balance, Beginning balance	3,400,000
Net premiums (discount), Beginning balance	(4,115)
Deferred costs, Beginning balance	(27,276)
Total debt, Beginning balance	3,368,609
Repayments, Extinguishment and Assumptions	(750,000)
Repayments, Extinguishment and Assumptions, Net	(750,000)
Accretion and Amortization	463
Accretion and Amortization, Deferred costs	3,248
Accretion and Amortization, Net	3,711
Outstanding balance, Ending balance	2,650,000
Net premiums (discount), Ending balance	(3,652)
Deferred costs, Ending balance	(24,028)
Total debt, Ending balance	2,622,320
Convertible Debt [Member]
Debt [Roll Forward]
Outstanding balance, Beginning balance	402,500
Net premiums (discount), Beginning balance	(3,909)
Deferred costs, Beginning balance	(3,708)
Total debt, Beginning balance	394,883
Accretion and Amortization	1,462
Accretion and Amortization, Deferred costs	1,381
Accretion and Amortization, Net	2,843
Outstanding balance, Ending balance	402,500
Net premiums (discount), Ending balance	(2,447)
Deferred costs, Ending balance	(2,327)
Total debt, Ending balance	397,726
Credit Facility [Member]
Debt [Roll Forward]
Outstanding balance, Beginning balance	403,000
Deferred costs, Beginning balance	(1,227)
Total debt, Beginning balance	401,773
Debt Issuances	1,061,000
Debt Issuances, Deferred costs	(4,280)
Debt Issuances, Net	1,056,720
Repayments, Extinguishment and Assumptions	(564,000)
Repayments, Extinguishment and Assumptions, Net	(564,000)
Accretion and Amortization, Deferred costs	858
Accretion and Amortization, Net	858
Outstanding balance, Ending balance	900,000
Deferred costs, Ending balance	(4,649)
Total debt, Ending balance	$ 895,351