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FAIR VALUE DISCLOSURES | 6 Months Ended
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Jun. 30, 2016
Fair Value Disclosures [Abstract] |
FAIR VALUE DISCLOSURES | FAIR VALUE DISCLOSURES We account for non-recurring fair value measurements of our non-financial assets and liabilities in accordance with ASC 820-10 Fair Value Measurement ("ASC 820"). This guidance defines fair value, establishes a framework for measuring fair value and addresses required disclosures about fair value measurements. This standard establishes a three-level hierarchy for fair value measurements based upon the significant inputs used to determine fair value. Observable inputs are those which are obtained from market participants external to the company while unobservable inputs are generally developed internally, utilizing management’s estimates, assumptions and specific knowledge of the assets/liabilities and related markets. The three levels are defined as follows:
• | Level 1 — Valuation is based on quoted prices in active markets for identical assets and liabilities.
• | Level 2 — Valuation is determined from quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar instruments in markets that are not active, or by model-based techniques in which all significant inputs are observable in the market.
• | Level 3 — Valuation is derived from model-based techniques in which at least one significant input is unobservable and based on the company’s own estimates about the assumptions that market participants would use to value the asset or liability.
If the only observable inputs are from inactive markets or for transactions which the company evaluates as “distressed”, the use of Level 1 inputs should be modified by the company to properly address these factors, or the reliance of such inputs may be limited, with a greater weight attributed to Level 3 inputs. Refer to Notes 1 and 2 for additional information regarding the valuation of our non-financial assets. Financial Instruments: The fair value of our fixed-rate debt is derived from quoted market prices by independent dealers (level 2 inputs as per the discussion above) and is as follows (in thousands):
|  | As of
|  | June 30, 2016 |  | December 31, 2015
|  | Aggregate Principal |  | Estimated Fair Value |  | Aggregate Principal |  | Estimated Fair Value
4.50% senior notes |  | $ | 175,000 |  |  | $ | 178,063 |  |  | $ | 175,000 |  |  | $ | 175,000 |
7.15% senior notes |  | $ | 300,000 |  |  | $ | 324,000 |  |  | $ | 300,000 |  |  | $ | 315,750 |
7.00% senior notes |  | $ | 300,000 |  |  | $ | 321,000 |  |  | $ | 300,000 |  |  | $ | 313,500 |
6.00% senior notes |  | $ | 200,000 |  |  | $ | 202,000 |  |  | $ | 200,000 |  |  | $ | 197,500 |
1.875% convertible senior notes |  | $ | 126,500 |  |  | $ | 125,077 |  |  | $ | 126,500 |  |  | $ | 124,128 |
Due to the short-term nature of other financial assets and liabilities including our Loans payable and other borrowings, we consider the carrying amounts of our other short-term financial instruments to approximate fair value.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13504-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 + Details
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