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FAIR VALUE DISCLOSURES (Tables) | 3 Months Ended
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Mar. 31, 2016
Fair Value Disclosures [Abstract] |
Schedule of Fair Value of Fixed-Rate Debt | 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
|  | March 31, 2016 |  | December 31, 2015
|  | Aggregate Principal |  | Estimated Fair Value |  | Aggregate Principal |  | Estimated Fair Value
4.50% senior notes |  | $ | 175,000 |  |  | $ | 176,750 |  |  | $ | 175,000 |  |  | $ | 175,000 |
7.15% senior notes |  | $ | 300,000 |  |  | $ | 316,500 |  |  | $ | 300,000 |  |  | $ | 315,750 |
7.00% senior notes |  | $ | 300,000 |  |  | $ | 319,500 |  |  | $ | 300,000 |  |  | $ | 313,500 |
6.00% senior notes |  | $ | 200,000 |  |  | $ | 200,000 |  |  | $ | 200,000 |  |  | $ | 197,500 |
1.875% convertible senior notes |  | $ | 126,500 |  |  | $ | 124,761 |  |  | $ | 126,500 |  |  | $ | 124,128 |

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- Definition Tabular disclosure of liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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