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Equity - Changes to Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 1,212,287	$ 1,149,428
Ending balance	1,219,983	1,165,771
Net unrealized gain (loss) on available-for-sale securities, tax benefit (provision)	(100)	(100)
Net Unrealized Gains on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	128,201	115,873
Other comprehensive income (loss) before reclassifications	(4,237)	2,930
Amounts reclassified from other accumulated comprehensive income	(9,387)	(3,928)
Net current-period other comprehensive (loss) income	(13,624)	(998)
Ending balance	114,577	114,875
Net Unrealized Losses on Interest Rate Agreements Accounted for as Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(42,953)	(44,020)
Other comprehensive income (loss) before reclassifications	8,431	1,733
Amounts reclassified from other accumulated comprehensive income	0	14
Net current-period other comprehensive (loss) income	8,431	1,747
Ending balance	$ (34,522)	$ (42,273)

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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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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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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