Equity and Capital - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Document Fiscal Year Focus	2016
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 51,139	$ 9,152	$ 9,353
Weighted Average Limited Partnership Units Outstanding, Basic	154,170	154,170	157,950
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Current period other comprehensive income, net	$ 40,831	$ (980)	$ (40,615)
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	51,139	9,152	9,353
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(10,587)	(9,897)	(49,524)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	50,910	8,995	9,180
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	(58,650)	(57,748)	(17,404)
Current period other comprehensive income, net	40,323	(902)	(40,344)
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	(18,327)	(58,650)	(57,748)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	24	(43)	7,752
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0	(7,752)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	(43)	0	0
Current period other comprehensive income, net	24	(43)	0
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	(19)	(43)	0
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(10,563)	(9,940)	(41,772)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	50,910	8,995	1,428
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	(58,693)	(57,748)	(17,404)
Current period other comprehensive income, net	40,347	(945)	(40,344)
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	(18,346)	(58,693)	(57,748)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	255	(192)	(444)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	229	157	173
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	(785)	(750)	(479)
Current period other comprehensive income, net	484	(35)	(271)
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	(301)	(785)	(750)
Accumulated Net Investment Gain (Loss) Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	0	0	13
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0	(13)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	0	0	0
Current period other comprehensive income, net	0	0	0
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	0	0	0
AOCI Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	255	(192)	(431)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	229	157	160
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	(785)	(750)	(479)
Current period other comprehensive income, net	484	(35)	(271)
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	(301)	(785)	(750)
AOCI Including Portion Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(10,308)	(10,132)	(42,203)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	51,139	9,152	1,588
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	(59,478)	(58,498)	(17,883)
Current period other comprehensive income, net	40,831	(980)	(40,615)
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	(18,647)	(59,478)	(58,498)
Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0	(7,765)
Parent Company [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	0	0	7,765
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	(58,693)
Current period other comprehensive income, net	40,831	(980)	(40,615)
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	(18,346)	(58,693)
Parent Company [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Current period other comprehensive income, net	$ 40,347	$ (945)	$ (40,344)