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Fair Value of Financial Assets and Liabilities
3 Months Ended
Mar. 31, 2018
Fair Value Disclosures [Abstract]  
Fair Value of Financial Assets and Liabilities
13. Fair Value of Financial Assets and Liabilities

A three-tier fair value hierarchy has been established which prioritizes the inputs used in measuring fair value. These tiers include:

 

    Level 1 - defined as observable inputs such as quoted prices in active markets;

 

    Level 2 - defined as observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities; and

 

    Level 3 - defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions.

Long-Term Debt:

Our financial assets and liabilities that are disclosed but not measured at fair value include the Senior Secured Notes and the Convertible Notes, which are reflected on the unaudited condensed consolidated balance sheet at cost. The fair value measurements are classified as Level 2 within the fair value hierarchy since they are based on quoted market prices of our instruments in markets that are not active. We estimated the fair value of the Senior Secured Notes and Convertible Notes by calculating the upfront cash payment a market participant would require to assume these obligations. The upfront cash payment used in the calculations of fair value on our March 31, 2018 unaudited condensed consolidated balance sheet, excluding any issuance costs, is the amount that a market participant would be willing to lend at March 31, 2018 to an entity with a credit rating similar to ours and achieve sufficient cash inflows to cover the scheduled cash outflows under the Senior Secured Notes and the Convertible Notes. The calculated fair value of our Convertible Notes is highly correlated to our stock price and as a result significant changes to our stock price could have a significant impact on the calculated fair value of our Convertible Notes.

The fair value and carrying value of long-term debt as of March 31, 2018 and December 31, 2017 were as follows (in thousands):

 

     March 31, 2018     December 31, 2017  
     Fair Value (1)       Carrying
Value
    Fair Value (1)       Carrying
Value
 

Senior Secured Notes

   $ 778,000      $ 704,835 (2)     $ 782,000      $ 705,520 (2)  

Convertible Notes

     327,000        316,768 (3)       330,000        311,544 (3)  

 

(1) Fair value amounts are rounded to the nearest million.
(2) Carrying value of the Senior Secured Notes includes unamortized debt premium and Consent Fees of $14.8 million and $15.5 million, respectively, as of March 31, 2018 and December 31, 2017. See Note 9, “Long-Term Debt and Other Liabilities,” for further information.
(3) Carrying value of the Convertible Notes excludes unamortized debt discount of $45.1 million and $50.4 million, respectively, as of March 31, 2018 and December 31, 2017. See Note 9, “Long-Term Debt and Other Liabilities,” for further information.

We have held-to-maturity financial instruments where carrying value approximates fair value. There were no fair value adjustments to these financial instruments during the three month periods ended March 31, 2018 and 2017.