Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

Fixed interest rate related to the interest rate derivative.

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- Definition

The amount of gain reclassified into earnings in the period when cash flow hedge is discontinued because it is probable that the original forecasted transactions will not occur by the end of the original period or an additional two month time period.

+ References

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-SubTopic 30
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- Definition

The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

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- Definition

Number of interest rate derivative instruments held by the entity at the reporting date.

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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Number of Interest Rate Derivatives Terminated

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Derivatives and Hedging (Narrative) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($) derivative_contract	Dec. 31, 2017 USD ($) derivative_contract	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Derivatives, Fair Value [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 1,922,721	$ 1,809,842	$ 1,785,359	$ 1,716,896
Gain (Loss) On Cash Flow Hedges [Member]
Derivatives, Fair Value [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 4,725	$ 7,424	$ 6,448	$ 6,403
Interest Rate Contracts [Member] \| Cash Flow Hedges [Member]
Derivatives, Fair Value [Line Items]
Number of active interest rate contracts held \| derivative_contract	0	3
Number of interest rate derivatives terminated \| derivative_contract	3
Notional amount of interest rate fair value hedge derivatives	$ 200,000	$ 200,000
Gain due to the probability that the related hedged forecasted transactions would no longer occur	3,400
Derivative, fixed Interest rate		1.50%
Cash flow hedge gain (loss) to be amortized within 12 months	$ 900