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Fair Value of Financial Instruments
3 Months Ended
Mar. 31, 2017
Financial Instruments, Owned, at Fair Value [Abstract]  
Fair Value of Financial Instruments
Fair Value of Financial Instruments

The financial instruments recorded in the consolidated balance sheets include investments, receivables, options sold, total return swaps, accounts payable, and secured and unsecured notes payable. Due to their short-term maturities, the carrying values of receivables and accounts payable approximate their fair values. All investments are carried at fair value in the consolidated balance sheets.

The following table presents the estimated fair values of financial instruments:
 
March 31, 2017
 
December 31, 2016
 
 
 
 
 
(Amounts in thousands)
Assets
 
 
 
Investments
$
3,600,498

 
$
3,547,560

Total return swaps

 
667

Liabilities
 
 
 
Total return swaps
$
1,405

 
$
765

Options sold
285

 
20

Secured notes

 
140,000

Unsecured notes
374,633

 
180,000


Investments
The Company applies the fair value option to all fixed maturity and equity securities and short-term investments at the time an eligible item is first recognized. The cost of investments sold is determined on a first-in and first-out method and realized gains and losses are included in net realized investment gains in the consolidated statements of operations. See Note 4. Fair Value Option for additional information.
Options Sold
The Company writes covered call options through listed and over-the-counter exchanges. When the Company writes an option, an amount equal to the premium received by the Company is recorded as a liability and is subsequently adjusted to the current fair value of the option written. Premiums received from writing options that expire unexercised are treated by the Company as realized gains from investments on the expiration date. If a call option is exercised, the premium is added to the proceeds from the sale of the underlying security or currency in determining whether the Company has realized a gain or loss. The Company, as writer of an option, bears the market risk of an unfavorable change in the price of the security underlying the written option. Liabilities for covered call options are included in other liabilities in the Company's consolidated balance sheets.
Total Return Swaps
The fair values of the total return swaps reflect the estimated amounts that, upon termination of the contracts, would be received for selling an asset or paid to transfer a liability in an orderly transaction.
Secured Notes
The fair values of the Company’s $120 million secured note and $20 million secured note at December 31, 2016 approximate their carrying values.
Unsecured Notes
The fair value of the Company’s publicly traded $375 million unsecured note at March 31, 2017 was obtained from a third party pricing service. The fair value of the Company's $180 million unsecured note at December 31, 2016 approximates its carrying value.

For additional disclosures regarding methods and assumptions used in estimating fair values, see Note 5. Fair Value Measurements.