Fair Value Measurements and Derivative Instruments

Fair Value Measurements

The estimated fair value of our financial instruments that are not measured at fair value, categorized based upon the fair value hierarchy, are as follows (in thousands):



	Fair Value Measurements at December 31, 2017 Using										Fair Value Measurements at December 31, 2016 Using
Description	Total Carrying Amount		Total Fair Value		Level 1⁽¹⁾		Level 2⁽²⁾		Level 3⁽³⁾		Total Carrying Amount		Total Fair Value		Level 1⁽¹⁾		Level 2⁽²⁾		Level 3⁽³⁾
Assets:
Cash and cash equivalents⁽⁴⁾	$	120,112	$	120,112	$	120,112	$	—	$	—	$	132,603	$	132,603	$	132,603	$	—	$	—
Total Assets	$	120,112	$	120,112	$	120,112	$	—	$	—	$	132,603	$	132,603	$	132,603	$	—	$	—
Liabilities:
Long-term debt (including current portion of long-term debt)⁽⁵⁾	$	7,506,312	$	8,038,092	$	—	$	8,038,092	$	—	$	9,347,051	$	9,859,266	$	—	$	9,859,266	$	—
Total Liabilities	$	7,506,312	$	8,038,092	$	—	$	8,038,092	$	—	$	9,347,051	$	9,859,266	$	—	$	9,859,266	$	—

___________________________________________________________________


(1)	Inputs based on quoted prices (unadjusted) in active markets for identical assets or liabilities that we have the ability to access. Valuation of these items does not entail a significant amount of judgment.

(2)

Inputs other than quoted prices included within Level 1 that are observable for the liability, either directly or indirectly. For unsecured revolving credit facilities and unsecured term loans, fair value is determined utilizing the income valuation approach. This valuation model takes into account the contract terms of our debt such as the debt maturity and the interest rate on the debt. The valuation model also takes into account the creditworthiness of the Company.


(3)	Inputs that are unobservable. The Company did not use any Level 3 inputs as of December 31, 2017 and December 31, 2016.


(4)	Consists of cash and marketable securities with original maturities of less than 90 days.


(5)	Consists of unsecured revolving credit facilities, senior notes, senior debentures and term loans. This does not include our capital lease obligations.

Other Financial Instruments

The carrying amounts of accounts receivable, accounts payable, accrued interest and accrued expenses approximate fair value at December 31, 2017 and December 31, 2016.

Assets and liabilities that are recorded at fair value have been categorized based upon the fair value hierarchy. The following table presents information about the Company's financial instruments recorded at fair value on a recurring basis (in thousands):



	Fair Value Measurements at December 31, 2017 Using								Fair Value Measurements at December 31, 2016 Using
Description	Total Fair Value		Level 1⁽¹⁾		Level 2⁽²⁾		Level 3⁽³⁾		Total Fair Value		Level 1⁽¹⁾		Level 2⁽²⁾		Level 3⁽³⁾
Assets:
Derivative financial instruments⁽⁴⁾	$	320,385	$	—	$	320,385	$	—	$	19,397	$	—	$	19,397	$	—
Investments⁽⁵⁾	3,340		3,340		—		—		3,576		3,576		—		—
Total Assets	$	323,725	$	3,340	$	320,385	$	—	$	22,973	$	3,576	$	19,397	$	—
Liabilities:
Derivative financial instruments⁽⁶⁾	$	115,961	$	—	$	115,961	$	—	$	373,497	$	—	$	373,497	$	—
Total Liabilities	$	115,961	$	—	$	115,961	$	—	$	373,497	$	—	$	373,497	$	—

___________________________________________________________________


(1)	Inputs based on quoted prices (unadjusted) in active markets for identical assets or liabilities that we have the ability to access. Valuation of these items does not entail a significant amount of judgment.

(2)

Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly. For foreign currency forward contracts, interest rate swaps, cross currency swaps and fuel swaps, fair value is derived using valuation models that utilize the income valuation approach. These valuation models take into account the contract terms, such as maturity as well as other inputs, such as foreign exchange rates and curves, fuel types, fuel curves and interest rate yield curves. All derivative instrument fair values take into account the creditworthiness of the counterparty and the Company.


(3)	Inputs that are unobservable. The Company did not use any Level 3 inputs as of December 31, 2017 and December 31, 2016.


(4)	Consists of foreign currency forward contracts, interest rate swaps and fuel swaps. Please refer to the "Fair Value of Derivative Instruments" table for breakdown by instrument type.


(5)	Consists of exchange-traded equity securities and mutual funds reported within Other assets in our consolidated balance sheets.


(6)	Consists of foreign currency forward contracts, interest rate swaps and fuel swaps. Please refer to the "Fair Value of Derivative Instruments" table for breakdown by instrument type.

The reported fair values are based on a variety of factors and assumptions. Accordingly, the fair values may not represent actual values of the financial instruments that could have been realized as of December 31, 2017 or December 31, 2016, or that will be realized in the future, and do not include expenses that could be incurred in an actual sale or settlement.

We have master International Swaps and Derivatives Association (“ISDA”) agreements in place with our derivative instrument counterparties. These ISDA agreements provide for final close out netting with our counterparties for all positions in the case of default or termination of the ISDA agreement. We have determined that our ISDA agreements provide us with rights of setoff on the fair value of derivative instruments in a gain position and those in a loss position with the same counterparty. We have elected not to offset such derivative instrument fair values in our consolidated balance sheets.

See Credit Related Contingent Features for further discussion on contingent collateral requirements for our derivative instruments.

The following table presents information about the Company’s offsetting of financial assets under master netting agreements with derivative counterparties:



	Gross Amounts not Offset in the Consolidated Balance Sheet that are Subject to Master Netting Agreements
	As of December 31, 2017									As of December 31, 2016
	Gross Amount of Derivative Assets Presented in the Consolidated Balance Sheet		Gross Amount of Eligible Offsetting Recognized Derivative Liabilities			Cash Collateral Received		Net Amount of Derivative Assets		Gross Amount of Derivative Assets Presented in the Consolidated Balance Sheet		Gross Amount of Eligible Offsetting Recognized Derivative Assets			Cash Collateral Received		Net Amount of Derivative Assets
(In thousands)
Derivatives subject to master netting agreements	$	320,385	$	(104,751	)	$	—	$	215,634	$	19,397	$	(19,397	)	$	—	$	—
Total	$	320,385	$	(104,751	)	$	—	$	215,634	$	19,397	$	(19,397	)	$	—	$	—

The following table presents information about the Company’s offsetting of financial liabilities under master netting agreements with derivative counterparties:



	Gross Amounts not Offset in the Consolidated Balance Sheet that are Subject to Master Netting Agreements
	As of December 31, 2017										As of December 31, 2016
	Gross Amount of Derivative Liabilities Presented in the Consolidated Balance Sheet			Gross Amount of Eligible Offsetting Recognized Derivative Assets		Cash Collateral Pledged		Net Amount of Derivative Liabilities			Gross Amount of Derivative Liabilities Presented in the Consolidated Balance Sheet			Gross Amount of Eligible Offsetting Recognized Derivative Liabilities		Cash Collateral Pledged		Net Amount of Derivative Liabilities
(In thousands)
Derivatives subject to master netting agreements	$	(115,961	)	$	104,751	$	—	$	(11,210	)	$	(373,497	)	$	19,397	$	7,213	$	(346,887	)
Total	$	(115,961	)	$	104,751	$	—	$	(11,210	)	$	(373,497	)	$	19,397	$	7,213	$	(346,887	)

Derivative Instruments

We are exposed to market risk attributable to changes in interest rates, foreign currency exchange rates and fuel prices. We try to mitigate these risks through a combination of our normal operating and financing activities and through the use of derivative financial instruments pursuant to our hedging practices and policies. The financial impact of these hedging instruments is primarily offset by corresponding changes in the underlying exposures being hedged. We achieve this by closely matching the notional amount, term and conditions of the derivative instrument with the underlying risk being hedged. Although certain of our derivative financial instruments do not qualify or are not accounted for under hedge accounting, our objective is not to hold or issue derivative financial instruments for trading or other speculative purposes.

We enter into various forward, swap and option contracts to manage our interest rate exposure and to limit our exposure to fluctuations in foreign currency exchange rates and fuel prices. These instruments are recorded on the balance sheet at their fair value and the vast majority are designated as hedges. We also use non-derivative financial instruments designated as hedges of our net investment in our foreign operations and investments.

At inception of the hedge relationship, a derivative instrument that hedges the exposure to changes in the fair value of a firm commitment or a recognized asset or liability is designated as a fair value hedge. A derivative instrument that hedges a forecasted transaction or the variability of cash flows related to a recognized asset or liability is designated as a cash flow hedge.

Changes in the fair value of derivatives that are designated as fair value hedges are offset against changes in the fair value of the underlying hedged assets, liabilities or firm commitments. Gains and losses on derivatives that are designated as cash flow hedges are recorded as a component of Accumulated other comprehensive loss until the underlying hedged transactions are recognized in earnings. The foreign currency transaction gain or loss of our non-derivative financial instruments and the changes in the fair value of derivatives designated as hedges of our net investment in foreign operations and investments are recognized as a component of Accumulated other comprehensive loss along with the associated foreign currency translation adjustment of the foreign operation or investment.

On an ongoing basis, we assess whether derivatives used in hedging transactions are "highly effective" in offsetting changes in the fair value or cash flow of hedged items. We use the long-haul method to assess hedge effectiveness using regression analysis for each hedge relationship under our interest rate, foreign currency and fuel hedging programs. We apply the same methodology on a consistent basis for assessing hedge effectiveness to all hedges within each hedging program (i.e., interest rate, foreign currency and fuel). We perform regression analyses over an observation period of up to three years, utilizing market data relevant to the hedge horizon of each hedge relationship. High effectiveness is achieved when a statistically valid relationship reflects a high degree of offset and correlation between the changes in the fair values of the derivative instrument and the hedged item. The determination of ineffectiveness is based on the amount of dollar offset between the change in fair value of the derivative instrument and the change in fair value of the hedged item at the end of the reporting period. If it is determined that a derivative is not highly effective as a hedge or hedge accounting is discontinued, any change in fair value of the derivative since the last date at which it was determined to be effective is recognized in earnings. In addition, the ineffective portion of our highly effective hedges is immediately recognized in earnings and reported in Other expense in our consolidated statements of comprehensive income (loss).

Cash flows from derivative instruments that are designated as fair value or cash flow hedges are classified in the same category as the cash flows from the underlying hedged items. In the event that hedge accounting is discontinued, cash flows subsequent to the date of discontinuance are classified within investing activities. Cash flows from derivative instruments not designated as hedging instruments are classified as investing activities.

We consider the classification of the underlying hedged item’s cash flows in determining the classification for the designated derivative instrument’s cash flows. We classify derivative instrument cash flows from hedges of benchmark interest rate or hedges of fuel expense as operating activities due to the nature of the hedged item. Likewise, we classify derivative instrument cash flows from hedges of foreign currency risk on our newbuild ship payments as investing activities and derivative instrument cash flows from hedges of foreign currency risk on debt payments as financing activities.

The following table presents information on the Company's cash flows from derivative instruments classified as investing activities in our Consolidated Statements of Cash Flows (in thousands):



	For the Years Ended December 31,
	2017			2016			2015
Cash received on settlement of derivative financial instruments	$	63,777		$	110,637		$	2,148
Cash paid on settlement of derivative financial instruments	(553		)	(323,839		)	(180,745		)
Cash received (paid) on settlement of derivative financial instruments	$	63,224		$	(213,202	)	$	(178,597	)

Interest Rate Risk

Our exposure to market risk for changes in interest rates relates to our long-term debt obligations including future interest payments. At December 31, 2017, approximately 57.4% of our long-term debt was effectively fixed as compared to 40.5% as of December 31, 2016. We use interest rate swap agreements to modify our exposure to interest rate movements and to manage our interest expense.

Market risk associated with our long-term fixed rate debt is the potential increase in fair value resulting from a decrease in interest rates. We use interest rate swap agreements that effectively convert a portion of our fixed-rate debt to a floating-rate basis to manage this risk. At December 31, 2017 and December 31, 2016, we maintained interest rate swap agreements on the following fixed-rate debt instruments:



Debt Instrument	Swap Notional as of December 31, 2017 (In thousands)		Maturity	Debt Fixed Rate	Swap Floating Rate: LIBOR plus	All-in Swap Floating Rate as of December 31, 2017
Oasis of the Seas term loan	$	140,000	October 2021	5.41%	3.87%	5.44%
Unsecured senior notes	650,000		November 2022	5.25%	3.63%	5.05%
	$	790,000

These interest rate swap agreements are accounted for as fair value hedges.

Market risk associated with our long-term floating rate debt is the potential increase in interest expense from an increase in interest rates. We use interest rate swap agreements that effectively convert a portion of our floating-rate debt to a fixed-rate basis to manage this risk. At December 31, 2017 and December 31, 2016, we maintained interest rate swap agreements on the following floating-rate debt instruments:



Debt Instrument	Swap Notional as of December 31, 2017 (In thousands)		Maturity	Debt Floating Rate		All-in Swap Fixed Rate
Celebrity Reflection term loan	$	381,792	October 2024	LIBOR plus	0.40%	2.85%
Quantum of the Seas term loan	551,250		October 2026	LIBOR plus	1.30%	3.74%
Anthem of the Seas term loan	573,958		April 2027	LIBOR plus	1.30%	3.86%
Ovation of the Seas term loan	726,250		April 2028	LIBOR plus	1.00%	3.16%
Harmony of the Seas term loan ⁽¹⁾	728,373		May 2028	EURIBOR plus	1.15%	2.26%
	$	2,961,623

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(1)	Interest rate swap agreements hedging the Euro-denominated term loan for Harmony of the Seas include a EURIBOR zero-floor matching the hedged debt EURIBOR zero-floor. Amount presented is based on the exchange rate as of December 31, 2017.

These interest rate swap agreements are accounted for as cash flow hedges.

The notional amount of interest rate swap agreements related to outstanding debt as of December 31, 2017 and 2016 was $3.8 billion and $4.0 billion, respectively.

Foreign Currency Exchange Rate Risk

Derivative Instruments

Our primary exposure to foreign currency exchange rate risk relates to our ship construction contracts denominated in Euros, our foreign currency denominated debt and our international business operations. We enter into foreign currency forward contracts, collar options and cross currency swap agreements to manage portions of the exposure to movements in foreign currency exchange rates. As of December 31, 2017, the aggregate cost of our ships on order, not including the TUI Cruises' ships on order was approximately $13.3 billion, of which we had deposited $465.7 million as of such date. Approximately 54.0% and 66.7% of the aggregate cost of the ships under construction was exposed to fluctuations in the Euro exchange rate at December 31, 2017 and 2016, respectively. The majority of our foreign currency forward contracts, collar options and cross currency swap agreements are accounted for as cash flow, fair value or net investment hedges depending on the designation of the related hedge.

On a regular basis, we enter into foreign currency forward contracts and, from time to time, we utilize cross-currency swap agreements to minimize the volatility resulting from the remeasurement of net monetary assets and liabilities denominated in a currency other than our functional currency or the functional currencies of our foreign subsidiaries. During the fourth quarter of 2017, we maintained an average of approximately $843.3 million of these foreign currency forward contracts. These instruments are not designated as hedging instruments. In 2017, 2016 and 2015 changes in the fair value of the foreign currency forward contracts resulted in a gain (loss) of approximately $62.0 million, $(51.1) million and $(55.5) million, respectively, which offset (losses) gains arising from the remeasurement of monetary assets and liabilities denominated in foreign currencies in those same years of $(75.6) million, $39.8 million and $34.6 million, respectively. These changes were recognized in earnings within Other expense in our consolidated statements of comprehensive income (loss).

We consider our investments in our foreign operations to be denominated in relatively stable currencies and of a long-term nature. As of December 31, 2017, we maintained foreign currency forward contracts and designated them as hedges of a portion of our net investment in TUI cruises of €101.0 million, or approximately $121.3 million based on the exchange rate at December 31, 2017. These forward currency contracts mature in October 2021.

The notional amount of outstanding foreign exchange contracts, including our forward contracts, as of December 31, 2017 and 2016 was $4.6 billion and $1.3 billion, respectively.

Non-Derivative Instruments

We also address the exposure of our investments in foreign operations by denominating a portion of our debt in our subsidiaries' and investments' functional currencies and designating it as a hedge of these subsidiaries and investments. We had designated debt as a hedge of our net investments in TUI Cruises of approximately €246.0 million, or approximately $295.3 million, through December 31, 2017. As of December 31, 2016, we had designated debt as a hedge of our net investments in TUI Cruises of approximately €295.0 million, or approximately $311.2 million.

Fuel Price Risk

Our exposure to market risk for changes in fuel prices relates primarily to the consumption of fuel on our ships. We use fuel swap agreements to mitigate the financial impact of fluctuations in fuel prices.

Our fuel swap agreements are accounted for as cash flow hedges. At December 31, 2017, we have hedged the variability in future cash flows for certain forecasted fuel transactions occurring through 2021. As of December 31, 2017 and 2016, we had the following outstanding fuel swap agreements:



	Fuel Swap Agreements
	As of December 31, 2017	As of December 31, 2016
	(metric tons)
2017	—	799,065
2018	673,700	616,300
2019	668,500	521,000
2020	531,200	306,500
2021	224,900	—



	Fuel Swap Agreements
	As of December 31, 2017		As of December 31, 2016
	(% hedged)
Projected fuel purchases for year:
2017	—		60	%
2018	50	%	44	%
2019	46	%	35	%
2020	36	%	20	%
2021	14	%	—	%

At December 31, 2017 and 2016, $23.7 million and $138.5 million, respectively, of estimated unrealized net loss associated with our cash flow hedges pertaining to fuel swap agreements were expected to be reclassified to earnings from Accumulated other comprehensive loss within the next 12 months. Reclassification is expected to occur as the result of fuel consumption associated with our hedged forecasted fuel purchases.

The fair value and line item caption of derivative instruments recorded within our consolidated balance sheets were as follows:



	Fair Value of Derivative Instruments
	Asset Derivatives					Liability Derivatives
	Balance Sheet Location	As of December 31, 2017		As of December 31, 2016		Balance Sheet Location	As of December 31, 2017		As of December 31, 2016
	Balance Sheet Location	Fair Value		Fair Value		Balance Sheet Location	Fair Value		Fair Value
(In thousands)
Derivatives designated as hedging instruments under ASC 815-20⁽¹⁾
Interest rate swaps	Other assets	$	7,330	$	5,246	Other long-term liabilities	$	46,509	$	57,679
Foreign currency forward contracts	Derivative financial instruments	68,352		—		Derivative financial instruments	—		5,574
Foreign currency forward contracts	Other assets	158,879		—		Other long-term liabilities	6,625		68,165
Fuel swaps	Derivative financial instruments	13,137		—		Derivative financial instruments	38,488		129,486
Fuel swaps	Other assets	51,265		13,608		Other long-term liabilities	13,411		95,125
Total derivatives designated as hedging instruments under ASC 815-20		298,963		18,854			105,033		356,029
Derivatives not designated as hedging instruments under ASC 815-20
Foreign currency forward contracts	Derivative Financial Instruments	9,945		—		Derivative financial instruments	2,933		—
Foreign currency forward contracts	Other assets	2,793		—		Other long-term liabilities	1,139		—
Fuel swaps	Derivative financial instruments	7,886		—		Derivative financial instruments	6,043		11,532
Fuel swaps	Other assets	798		543		Other long-term liabilities	813		5,936
Total derivatives not designated as hedging instruments under ASC 815-20		21,422		543			10,928		17,468
Total derivatives		$	320,385	$	19,397		$	115,961	$	373,497

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(1)	Accounting Standard Codification 815-20 "Derivatives and Hedging."

The carrying value and line item caption of non-derivative instruments designated as hedging instruments recorded within our consolidated balance sheets were as follows:



		Carrying Value
Non-derivative instrument designated as hedging instrument under ASC 815-20	Balance Sheet Location	As of December 31, 2017		As of December 31, 2016
(In thousands)
Foreign currency debt	Current portion of long-term debt	$	70,097	$	61,601
Foreign currency debt	Long-term debt	225,226		249,624
		$	295,323	$	311,225

The effect of derivative instruments qualifying and designated as hedging instruments and the related hedged items in fair value hedges on the consolidated statements of comprehensive income (loss) was as follows:



	Location of Gain (Loss) Recognized in Income on Derivative and Hedged Item	Amount of Gain (Loss) Recognized in Income on Derivative						Amount of Gain (Loss) Recognized in Income on Hedged Item
Derivatives and Related Hedged Items under ASC 815-20 Fair Value Hedging Relationships		Year Ended December 31, 2017			Year Ended December 31, 2016			Year Ended December 31, 2017		Year Ended December 31, 2016
(In thousands)
Interest rate swaps	Interest expense, net of interest capitalized	$	3,007		$	7,448		$	—	$	7,203
Interest rate swaps	Other expense	(3,139		)	(3,625		)	6,065		5,072
		$	(132	)	$	3,823		$	6,065	$	12,275

The effect of derivative instruments qualifying and designated as cash flow hedging instruments on the consolidated financial statements was as follows:



	Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives (Effective Portion)						Location of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion)						Location of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness testing)
Derivatives under ASC 815-20 Cash Flow Hedging Relationships	Year Ended December 31, 2017			Year Ended December 31, 2016				Year Ended December 31, 2017			Year Ended December 31, 2016				Year Ended December 31, 2017		Year Ended December 31, 2016
(In thousands)
Interest rate swaps	$	(13,312	)	$	(31,049	)	Interest expense	$	(31,603	)	$	(41,480	)	Other expense	$	—	$	—
Foreign currency forward contracts	276,573			(51,092		)	Depreciation and amortization expenses	(10,840		)	(8,114		)	Other expense	131		—
Foreign currency forward contracts	—			—			Other expense	(9,472		)	(14,342		)	Other expense	—		(59		)
Foreign currency forward contracts	—			—			Other indirect operating expenses	—			(207		)	Other expense	—		—
Foreign currency collar options	—			—			Depreciation and amortization expenses	(2,408		)	(2,408		)	Other expense	—		—
Fuel swaps	—			—			Other expense	7,382			13,685			Other expense	—		—
Fuel swaps	118,604			156,139			Fuel	(141,689		)	(284,384		)	Other expense	2,738		(751		)
	$	381,865		$	73,998			$	(188,630	)	$	(337,250	)		$	2,869	$	(810	)

The effect of non-derivative instruments qualifying and designated as net investment hedging instruments on the consolidated financial statements was as follows:



	Amount of Gain (Loss) Recognized in Other Comprehensive Income (Effective Portion)					Location of Gain (Loss) in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing)	Amount of Gain (Loss) Recognized in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing)
Non-derivative instruments under ASC 815-20 Net Investment Hedging Relationships	Year Ended December 31, 2017			Year Ended December 31, 2016			Year Ended December 31, 2017		Year Ended December 31, 2016
(In thousands)
Foreign Currency Debt	$	(38,971	)	$	20,295	Other expense	$	—	$	—
	$	(38,971	)	$	20,295		$	—	$	—

The effect of derivatives not designated as hedging instruments on the consolidated financial statements was as follows:



		Amount of Gain (Loss) Recognized in Income on Derivatives
Derivatives Not Designated as Hedging Instruments under ASC 815-20	Location of Gain (Loss) Recognized in Income on Derivatives	Year Ended December 31, 2017			Year Ended December 31, 2016
(In thousands)
Foreign currency forward contracts	Other expense	$	61,952		$	(51,029	)
Fuel swaps	Other expense	(1,133		)	(1,000		)
		$	60,819		$	(52,029	)

Credit Related Contingent Features

Our current interest rate derivative instruments may require us to post collateral if our Standard & Poor's and Moody's credit ratings are below specified levels. Specifically, if on the fifth anniversary of executing a derivative instrument or on any succeeding fifth-year anniversary our credit ratings for our senior unsecured debt were to be rated below BBB- by Standard & Poor's and Baa3 by Moody's, then the counterparty may periodically demand that we post collateral in an amount equal to the difference between (i) the net market value of all derivative transactions with such counterparty that have reached their fifth year anniversary, to the extent negative, and (ii) the applicable minimum call amount.

The amount of collateral required to be posted following such event will change as, and to the extent, our net liability position increases or decreases by more than the applicable minimum call amount. If our credit rating for our senior unsecured debt is subsequently equal to, or above BBB- by Standard & Poor's or Baa3 by Moody's, then any collateral posted at such time will be released to us and we will no longer be required to post collateral unless we meet the collateral trigger requirement at the next fifth-year anniversary. At December 31, 2017, four of our interest rate derivative instruments had reached their fifth anniversary; however, our senior unsecured debt credit rating was BBB- by Standard & Poor's and Baa3 by Moody's and, accordingly, we were not required to post any collateral as of such date. As of December 31, 2016, two of our interest rate derivative instruments had reached their fifth anniversary. As our unsecured debt credit rating at December 31, 2016 was below BBB-/Baa3, we had posted $7.2 million in collateral as of such date. Consistent with the provisions of our interest rate derivatives instruments, all collateral that was posted with our counterparties was returned upon reaching investment grade.