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Derivatives and Hedging Activities (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($) Debt_Instrument	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) Debt_Instrument	Sep. 30, 2017 USD ($)	Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in OCI on derivative(1)	$ 4,061	$ (179)	$ 23,107	$ (1,944)
Amount of (gain) loss reclassified from AOCI into interest expense(1)	$ (1,192)	$ 228	(1,895)	$ 1,203
Interest Rate Swap | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments, gain (loss) reclassification from OCI to income, estimated net amount to be transferred			$ 8,800
Count | Debt_Instrument	6		6
Derivative, notional amount	$ 992,000		$ 992,000
Interest Rate Swap | Designated as Hedging Instrument | Minimum
Derivative Instruments, Gain (Loss) [Line Items]
Fixed LIBOR	1.20%		1.20%		1.20%
Interest Rate Swap | Designated as Hedging Instrument | Maximum
Derivative Instruments, Gain (Loss) [Line Items]
Fixed LIBOR	2.20%		2.20%		2.20%

X

- Definition

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

+ References

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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Fixed interest rate related to the interest rate derivative.

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The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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