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Fair Value of Instruments
12 Months Ended
Dec. 31, 2018
Fair Value Disclosures [Abstract]  
Fair Value of Instruments
Fair Value of Instruments
We disclose fair value information about all financial instruments, whether or not recognized in the consolidated balance sheets, for which it is practicable to estimate fair value. Current accounting guidance requires the Company to disclose fair value information about all financial instruments, whether or not recognized in the balance sheets, for which it is practicable to estimate fair value.
The Company’s disclosures of estimated fair value of financial instruments at December 31, 2018 and December 31, 2017 were determined using available market information and appropriate valuation methods. Considerable judgment is necessary to interpret market data and develop estimated fair value. The use of different market assumptions or estimation methods may have a material effect on the estimated fair value amounts.

The carrying amounts for cash and cash equivalents, restricted cash, accounts and other receivables, accounts payable and other accrued liabilities, accrued dividends and distributions, security deposits and prepaid rents approximate fair value because of the short-term nature of these instruments. As described in Note 15. "Derivative Instruments", the interest rate swaps and foreign currency forward contracts are recorded at fair value.

We calculate the fair value of our mortgage loans, unsecured term loan and unsecured senior notes based on currently available market rates assuming the loans are outstanding through maturity and considering the collateral and other loan terms. In determining the current market rate for fixed rate debt, a market spread is added to the quoted yields on federal government treasury securities with similar maturity dates to our debt. The carrying value of our global revolving credit facility approximates fair value, due to the variability of interest rates.
As of December 31, 2018 and December 31, 2017, the aggregate estimated fair value and carrying value of our global revolving credit facility, unsecured term loan, unsecured senior notes and mortgage loans were as follows (in thousands):
 
Categorization
under the fair value
hierarchy
 
As of December 31, 2018
 
As of December 31, 2017
 
Estimated Fair Value
 
Carrying Value
 
Estimated Fair Value
 
Carrying Value
Global revolving credit facilities (1)(5)
Level 2
 
$
1,663,156

 
$
1,663,156

 
$
558,191

 
$
558,191

Unsecured term loans (2)(6)
Level 2
 
1,183,121

 
1,183,121

 
1,425,117

 
1,425,117

Unsecured senior notes (3)(4)(7)
Level 2
 
7,684,368

 
7,629,679

 
6,976,603

 
6,608,545

Mortgage loans (3)(8)
Level 2
 
706,086

 
705,924

 
106,523

 
106,611

 
 
 
$
11,236,731

 
$
11,181,880

 
$
9,066,434

 
$
8,698,464


(1)
The carrying value of our global revolving credit facility approximates estimated fair value, due to the variability of interest rates and the stability of our credit ratings.
(2)
The carrying value of our unsecured term loans approximates estimated fair value, due to the variability of interest rates and the stability of our credit ratings.
(3)
Valuations for our unsecured senior notes and mortgage loans are determined based on the expected future payments discounted at risk-adjusted rates. The 2019 Notes, 5.875% 2020 Notes, 3.400% 2020 Notes, 2021 Notes, 3.950% 2022 Notes, 3.625% 2022 Notes, 4.750% 2023 Notes, 2.750% 2023 Notes, 2.625% 2024 Notes, 2.750% 2024 Notes, 4.750% 2025 Notes, 4.250% 2025 Notes, 2027 Notes, 2028 Notes, 2029 Notes and 2030 Notes are valued based on quoted market prices.
(4)
The carrying value of the 5.875% 2020 Notes, 3.400% 2020 Notes, 2021 Notes, 3.625% 2022 Notes, 3.950% 2022 Notes, 4.750% 2023 Notes, 2.750% 2023 Notes, 2.625% 2024 Notes, 2.750% 2024 Notes, 4.250% 2025 Notes, 2027 Notes, 2028 Notes, 2029 Notes and 2030 Notes are net of discount of $19.9 million and $18.5 million in the aggregate as of December 31, 2018 and December 31, 2017, respectively.
(5)
The estimated fair value and carrying value are exclusive of deferred financing costs of $15.4 million and $7.2 million as of December 31, 2018 and December 31, 2017, respectively.
(6)
The estimated fair value and carrying value are exclusive of deferred financing costs of $4.2 million and $4.8 million as of December 31, 2018 and December 31, 2017, respectively.
(7)
The estimated fair value and carrying value are exclusive of deferred financing costs of $40.6 million and $38.3 million as of December 31, 2018 and December 31, 2017, respectively.
(8)
The estimated fair value and carrying value are exclusive of deferred financing costs of $20.2 million and $0.0 million as of December 31, 2018 and December 31, 2017, respectively.