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Equity - Changes to Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			$ 1,149,428,000	$ 1,146,265,000
Ending balance	$ 1,208,640,000	$ 1,130,130,000	1,208,640,000	1,130,130,000
Net unrealized gain (loss) on available-for-sale securities, tax benefit (provision)	0	200,000	(100,000)	600,000
Net Unrealized Gains on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	114,364,000	116,849,000	115,873,000	139,356,000
Other comprehensive income (loss) before reclassifications	13,158,000	9,038,000	17,899,000	5,195,000
Amounts reclassified from other accumulated comprehensive income	(853,000)	(1,319,000)	(7,103,000)	(19,983,000)
Net current-period other comprehensive income (loss)	12,305,000	7,719,000	10,796,000	(14,788,000)
Ending balance	126,669,000	124,568,000	126,669,000	124,568,000
Net Unrealized Losses on Interest Rate Agreements Accounted for as Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(44,688,000)	(70,518,000)	(44,020,000)	(47,363,000)
Other comprehensive income (loss) before reclassifications	321,000	647,000	(375,000)	(22,545,000)
Amounts reclassified from other accumulated comprehensive income	14,000	18,000	42,000	55,000
Net current-period other comprehensive income (loss)	335,000	665,000	(333,000)	(22,490,000)
Ending balance	$ (44,353,000)	$ (69,853,000)	$ (44,353,000)	$ (69,853,000)

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
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- Definition

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.

+ References

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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

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- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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