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Fair Value of Financial Instruments
6 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments
Fair Value of Financial Instruments
Financial Instruments Reported at Fair Value - Recurring
The table below presents our assets and liabilities measured at fair value on a recurring basis as of June 30, 2018, aggregated by the applicable level in the fair value hierarchy (in thousands):
 
 
Level 1
 
Level 2
 
Level 3
 
Total
Assets:
 
 
 
 
 
 
 
 
Derivative financial instruments
 
$

 
$
1,999

 
$

 
$
1,999

Liabilities:
 
 
 
 
 
 
 
 
Derivative financial instruments
 
$

 
$
548

 
$

 
$
548

The table below presents our assets and liabilities measured at fair value on a recurring basis as of December 31, 2017, aggregated by the applicable level in the fair value hierarchy (in thousands):
 
 
Level 1
 
Level 2
 
Level 3
 
Total
Assets:
 
 
 
 
 
 
 
 
Derivative financial instruments
 
$


$
1,529


$

 
$
1,529

Liabilities:
 
 
 
 
 
 
 
 
Derivative financial instruments
 
$

 
$
1,089

 
$

 
$
1,089


Financial Instruments Reported at Fair Value - Non-Recurring
The table below presents our assets measured at fair value on a non-recurring basis as of June 30, 2018, aggregated by the applicable level in the fair value hierarchy (in thousands):
 
 
Level 1
 
Level 2
 
Level 3
 
Total
Assets:
 
 
 
 
 
 
 
 
MOB (1)
 
$

 
$
12,985

 
$

 
$
12,985

 
 
 
 
 
 
 
 
 
(1) During the six months ended June 30, 2018, we recognized $4.6 million of impairment charges to the carrying value of two MOBs. The estimated fair value as of June 30, 2018 for these MOBs was based upon a sales agreement.
The table below presents our assets measured at fair value on a non-recurring basis as of December 31, 2017, aggregated by the applicable level in the fair value hierarchy (in thousands):
 
 
Level 1
 
Level 2
 
Level 3
 
Total
Assets:
 
 
 
 
 
 
 
 
MOB (1)
 
$

 
$
10,271

 
$

 
$
10,271

 
 
 
 
 
 
 
 
 
(1) During the year ended December 31, 2017, we recognized $13.9 million of impairment charges to the carrying value of two MOBs and a portfolio of MOBs. The estimated fair value as of December 31, 2017 for these MOBs was based upon a pending sales agreement and real estate market comparables.

There have been no transfers of assets or liabilities between levels. We will record any such transfers at the end of the reporting period in which a change of event occurs that results in a transfer. Although we have determined that the majority of the inputs used to value our interest rate swap derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with these instruments utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by us and our counterparties. However, we have assessed the significance of the impact of the credit valuation adjustments on the overall valuation of our interest rate swap derivative positions and have determined that the credit valuation adjustments are not significant to their overall valuation. As a result, we have determined that our interest rate swap derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy. 
Financial Instruments Disclosed at Fair Value
We consider the carrying values of cash and cash equivalents, tenant and other receivables, restricted cash and accounts payable, and accrued liabilities, to approximate fair value for these financial instruments because of the short period of time between origination of the instruments and their expected realization. All of these financial instruments are considered Level 2.
The fair value of debt is estimated using borrowing rates available to us with similar terms and maturities, which is considered a Level 2 input. As of June 30, 2018, the fair value of the debt was $2,643.1 million compared to the carrying value of $2,683.5 million. As of December 31, 2017, the fair value of the debt was $2,826.3 million compared to the carrying value of $2,781.0 million.