Equity and Capital - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income Loss [Roll Forward]
Current period other comprehensive income, net	$ 2,620	$ (14,368)
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, Net of Tax	(88)	(16,581)
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance	(18,327)	(58,650)
Current period other comprehensive income, net	2,522	(14,164)
Ending balance	(15,805)	(72,814)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	2,610	2,417
Accumulated Net Investment Gain (Loss) Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0	0
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance	0	0
Current period other comprehensive income, net	0	0
Ending balance	0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0
AOCI Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	21	(204)
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance	(301)	(785)
Current period other comprehensive income, net	65	(168)
Ending balance	(236)	(953)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	44	36
AOCI Including Portion Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(35)	(16,821)
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance	(18,647)	(59,478)
Current period other comprehensive income, net	2,619	(14,368)
Ending balance	(16,028)	(73,846)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	2,654	2,453
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	32	(36)
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance	(19)	(43)
Current period other comprehensive income, net	32	(36)
Ending balance	13	(79)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(56)	(16,617)
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance	(18,346)	(58,693)
Current period other comprehensive income, net	2,554	(14,200)
Ending balance	(15,792)	(72,893)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	2,610	2,417
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, Net of Tax	21	(204)
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance	(301)	(785)
Current period other comprehensive income, net	65	(168)
Ending balance	(236)	(953)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	44	36
Partnership Interest [Member]
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance	(18,346)
Current period other comprehensive income, net	2,618	$ (14,368)
Ending balance	$ (15,791)