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Derivatives and Hedging Activities - Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance (Details) - Cash Flow Hedging - Interest rate swaps, net - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in accumulated other comprehensive income (loss) from derivatives (effective portion)	$ 2,018	$ (3,738)	$ 8,656	$ (12,364)
Amount of gain (loss) recognized in income on derivative instruments (ineffective portion, reclassifications of missed forecasted transactions and amounts excluded from effectiveness testing)	16	(1,102)	(96)	(1,007)
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of loss reclassified from accumulated other comprehensive income (loss) into income as interest expense (effective portion)	$ (755)	$ (1,461)	$ (3,090)	$ (4,523)

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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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The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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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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