Derivative Financial Instruments

During 2018, we entered into an aggregate of $225.0 million notional amount of forward-starting swaps that effectively lock the underlying 10-year treasury rate at a weighted average of 2.86% with respect to a planned issuance of debt securities by the Operating Partnership expected to occur prior to June 11, 2019.

During 2017, we entered into $150.0 million notional amount of forward-starting swaps that effectively locked the underlying 10-year treasury rate at 2.44% with respect to a planned issuance of debt securities by the Operating Partnership. Upon issuance of the $350.0 million aggregate principal amount of 4.125% notes due 2028 during 2018, we terminated the forward-starting swaps and received cash upon settlement. The unrealized gain of $7.0 million in accumulated other comprehensive income will be reclassified to interest expense as interest payments are made on the debt and a gain of $0.2 million of hedge ineffectiveness was recognized in interest expense.

During 2017, we also entered into floating-to-fixed interest rate swaps through January 2022 with respect to an aggregate of $50.0 million LIBOR-based borrowings. These swaps effectively fix the underlying one-month LIBOR rate at a weighted average rate of 1.693%.

During 2016, we entered into $150.0 million notional amount of forward-starting swaps that effectively locked the underlying 10-year treasury rate at 1.90% with respect to a planned issuance of debt securities by the Operating Partnership. Upon issuance of the $300.0 million aggregate principal amount of 3.875% notes due 2027 during 2017, we terminated the forward-starting swaps

and received cash upon settlement. The unrealized gain of $7.3 million in accumulated other comprehensive income will be reclassified to interest expense as interest payments are made on the debt.


6.	Derivative Financial Instruments - Continued

We also had floating-to-fixed interest rate swaps through January 11, 2019 with respect to an aggregate of $225.0 million LIBOR-based borrowings. These swaps effectively fixed the underlying one-month LIBOR rate at a weighted average rate of 1.678%.

The counterparties under our swaps are major financial institutions. The swap agreements contain a provision whereby if we default on certain of our indebtedness and which default results in repayment of such indebtedness being, or becoming capable of being, accelerated by the lender, then we could also be declared in default on our swaps.

Our interest rate swaps have been designated as and are being accounted for as cash flow hedges with the effective portion of changes in fair value recorded in other comprehensive income each reporting period. No significant gain or loss was recognized related to hedge ineffectiveness or to amounts excluded from effectiveness testing on our cash flow hedges during the years ended December 31, 2018 and 2017. We have no collateral requirements related to our interest rate swaps.

Amounts reported in accumulated other comprehensive income related to derivatives will be reclassified to interest expense as interest payments are made on our debt. During 2019, we estimate that $1.6 million will be reclassified as a net decrease to interest expense.

The following table sets forth the gross fair value of our derivatives:



	December 31,
	2018		2017
Derivatives:
Derivatives designated as cash flow hedges in prepaid expenses and other assets:
Interest rate swaps	$	1,146	$	1,286
Derivatives designated as cash flow hedges in accounts payable, accrued expenses and other liabilities:
Interest rate swaps	$	3,581	$	—

The following table sets forth the effect of our cash flow hedges on accumulated other comprehensive income and interest expense:



	Year Ended December 31,
	2018			2017		2016
Derivatives Designated as Cash Flow Hedges:
Amount of unrealized gains recognized in accumulated other comprehensive income on derivatives (effective portion):
Interest rate swaps	$	4,161		$	1,732	$	5,703
Amount of (gains)/losses reclassified out of accumulated other comprehensive income into contractual interest expense (effective portion):
Interest rate swaps	$	(2,086	)	$	1,157	$	3,057