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Derivatives and Hedging Activities (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) Debt_Instrument	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) Debt_Instrument	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) Debt_Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (loss) gain recognized in other comprehensive income on derivative	$ (9,193)	$ 4,061	$ (44,398)	$ 23,107
Amount of gain reclassified from AOCI into interest expense	(538)	$ (1,192)	(3,339)	$ (1,895)
Contingent credit-risk-related derivative liabilities, fair value	$ 28,300		28,300
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			$ 5,700
Derivative, count | Debt_Instrument	9		9		12
Derivative, notional amount	$ 1,402,000		$ 1,402,000		$ 1,687,000
Interest Rate Swap | Designated as Hedging Instrument | Minimum
Derivative Instruments, Gain (Loss) [Line Items]
Fixed LIBOR	0.80%		0.80%		0.70%
Interest Rate Swap | Designated as Hedging Instrument | Maximum
Derivative Instruments, Gain (Loss) [Line Items]
Fixed LIBOR	2.90%		2.90%		2.90%

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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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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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