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Equity - Changes to Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			$ 1,212,287,000	$ 1,149,428,000
Ending balance	$ 1,361,327,000	$ 1,208,640,000	1,361,327,000	1,208,640,000
Net unrealized gain (loss) on available-for-sale securities, tax benefit (provision)	0	0	100,000	(100,000)
Available-for-sale, tax provision	(2,000,000)		(2,000,000)
Net Unrealized Gains on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	106,725,000	114,364,000	128,201,000	115,873,000
Other comprehensive income (loss) before reclassifications	(2,408,000)	13,158,000	(9,749,000)	17,899,000
Amounts reclassified from other accumulated comprehensive income (2)	(5,686,000)	(853,000)	(19,821,000)	(7,103,000)
Net current-period other comprehensive (loss) income	(8,094,000)	12,305,000	(29,570,000)	10,796,000
Ending balance	98,631,000	126,669,000	98,631,000	126,669,000
Net Unrealized Losses on Interest Rate Agreements Accounted for as Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(31,105,000)	(44,688,000)	(42,953,000)	(44,020,000)
Other comprehensive income (loss) before reclassifications	4,801,000	321,000	16,649,000	(375,000)
Amounts reclassified from other accumulated comprehensive income (2)	0	14,000	0	42,000
Net current-period other comprehensive (loss) income	4,801,000	335,000	16,649,000	(333,000)
Ending balance	$ (26,304,000)	$ (44,353,000)	$ (26,304,000)	$ (44,353,000)

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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Amount of tax expense (benefit) before reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities and unrealized holding gain (loss) related to transfers of securities into the available-for-sale category and out of the held-to-maturity category.

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Amount of tax expense (benefit), after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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