FAIR VALUE OF FINANCIAL INSTRUMENTS	6 Months Ended
Jun. 30, 2019
Fair Value Disclosures [Abstract]
FAIR VALUE OF FINANCIAL INSTRUMENTS	NOTE 11. FAIR VALUE OF FINANCIAL INSTRUMENTS The fair value hierarchy has three levels based on the reliability of the inputs used to determine fair value. Level 1 refers to fair values determined based on quoted prices in active markets for identical assets or liabilities. Level 2 refers to fair values determined based on quoted prices for similar assets or liabilities in active markets or inputs that are observable to the asset or liability, either directly or indirectly through market corroboration. Level 3 refers to fair values determined based on unobservable inputs used in the measurement of assets and liabilities at fair value. The estimated fair values of our financial instruments have been determined at discrete points in time based on relevant market information. Our financial instruments consist of cash and cash equivalents, restricted cash, accounts receivable, accounts payable, accrued liabilities and long–term debt. The carrying amounts of our financial instruments, other than our 2023 Notes and Senior Notes, approximate fair value because of the short–term nature of the items. As of June 30, 2019, the estimated aggregate fair values and aggregate carrying values of our 2023 Notes and Senior Notes were $62.2 million and $52.3 million, respectively. As of December 31, 2018, the estimated aggregate fair values and aggregate carrying values of our 2023 Notes and Senior Notes was $50.7 million $51.0 million, respectively. As our 2023 Notes are not actively traded, the fair value determination of the 2023 Notes is categorized as Level 3 as the valuation was based on valuation techniques when observable market data is not available. The fair value determination of our Senior Notes is categorized as Level 2 as this valuation used dealer quoted prices in active markets obtained from independent third–party sources.

FAIR VALUE OF FINANCIAL INSTRUMENTS

6 Months Ended

Jun. 30, 2019

NOTE 11. FAIR VALUE OF FINANCIAL INSTRUMENTS

The fair value hierarchy has three levels based on the reliability of the inputs used to determine fair value. Level 1 refers to fair values determined based on quoted prices in active markets for identical assets or liabilities. Level 2 refers to fair values determined based on quoted prices for similar assets or liabilities in active markets or inputs that are observable to the asset or liability, either directly or indirectly through market corroboration. Level 3 refers to fair values determined based on unobservable inputs used in the measurement of assets and liabilities at fair value.

The estimated fair values of our financial instruments have been determined at discrete points in time based on relevant market information. Our financial instruments consist of cash and cash equivalents, restricted cash, accounts receivable, accounts payable, accrued liabilities and long–term debt. The carrying amounts of our financial instruments, other than our 2023 Notes and Senior Notes, approximate fair value because of the short–term nature of the items.

As of June 30, 2019, the estimated aggregate fair values and aggregate carrying values of our 2023 Notes and Senior Notes were $62.2 million and $52.3 million, respectively. As of December 31, 2018, the estimated aggregate fair values and aggregate carrying values of our 2023 Notes and Senior Notes was $50.7 million $51.0 million, respectively.

As our 2023 Notes are not actively traded, the fair value determination of the 2023 Notes is categorized as Level 3 as the valuation was based on valuation techniques when observable market data is not available. The fair value determination of our Senior Notes is categorized as Level 2 as this valuation used dealer quoted prices in active markets obtained from independent third–party sources.