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Fair Value Measurements
12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Fair Value Measurements
FAIR VALUE MEASUREMENTS
Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The fair value hierarchy requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. We are required to classify these financial assets and liabilities into two groups: recurring—measured on a periodic basis and non-recurring—measured on an as needed basis.
There are three levels of inputs that may be used to measure fair value:

Level 1
Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities.
Level 2
Quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in inactive markets; or valuations based on models where the significant inputs are observable or can be corroborated by observable market data.
Level 3
Valuations based on models where significant inputs are not observable. Unobservable inputs are used when little or no market data is available and reflect the Company’s own assumptions about the assumptions market participants would use.

Assets and liabilities measured at fair value on a recurring basis as of December 31, 2017 and 2016 is summarized in the following tables.
 
Dollar amounts in millions
December 31,
2017
 
Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)
 
Significant
Other Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Available for sale securities
$
6.0

 
$

 
$

 
$
6.0

Trading securities
3.1

 
3.1

 

 

 
Dollar amounts in millions
December 31,
2016
 
Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)
 
Significant
Other Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Available for sale securities
$
4.8

 
$

 
$

 
$
4.8

Trading securities
2.6

 
2.6

 

 


Due to the lack of observable market quotations on a portion of our ARS portfolio, we evaluate the structure of our ARS holdings and current market estimates of fair value, including fair value estimates from banks that rely exclusively on Level 3 inputs. These inputs include those that are based on expected cash flow streams and collateral values, including assessments of counterparty credit quality, default risk underlying the security, discount rates and overall capital market liquidity. The valuation of our ARS investment portfolio is subject to uncertainties that are difficult to predict. Factors that may impact our valuation include changes to credit ratings of the securities as well as to the underlying assets supporting those securities, rates of default of the underlying assets, underlying collateral value, discount rates, counterparty risk and ongoing strength and quality of market credit and liquidity.
Trading securities consist of rabbi trust financial assets which are recorded in other assets in our consolidated balance sheets. The rabbi trust holds assets attributable to the elections of certain management employees to defer the receipt of a portion of their compensation. The assets of the rabbi trust are invested in mutual funds and are reported at fair value based on active market quotations, which represent Level 1 inputs.
The following table summarizes changes in assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the twelve months ended December 31, 2017 and 2016. 
Dollar amounts in millions
Available for
sale securities
Balance at December 31, 2015
$
5.8

Total realized/unrealized gains (losses) included in other comprehensive income
(1.0
)
Balance at December 31, 2016
$
4.8

Total realized/unrealized gains (losses) included in other comprehensive income
1.2

Balance at December 31, 2017
$
6.0


Carrying amounts reported on the balance sheet for cash and cash equivalents, receivables and accounts payable approximate fair value due to the short-term maturity of these instruments. See discussion on fair market values on Notes Receivable from Asset Sales at Note 7 and Long-term Debt at Note 13.
We review the carrying values of long-lived assets to be held and used for impairment wherever events or changes in circumstances indicate possible impairment. An impairment loss is recognized when a long-lived asset's carrying value is not recoverable (given assumptions on housing starts and growth rates) and exceeds estimated fair value.     
During 2016, we entered into a non-monetary transaction to exchange our idled OSB mill for another idled mill. This transaction was recorded at the fair market value of both facilities based upon external appraisals. This transaction resulted in us recording a gain of $10.6 million equal to the excess fair value over the net book value of the facility being exchanged.