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FAIR VALUE DISCLOSURES - Schedule of Fair Value of Fixed-Rate Debt (Details) - Senior Notes [Member] - USD ($) | Dec. 31, 2015 | Jun. 02, 2015 | Dec. 31, 2014 | Mar. 31, 2013 | Sep. 30, 2012 | Apr. 30, 2012 | Dec. 31, 2010
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4.50% senior notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate Principal |  |  |  | $ 175,000,000 |  |  |
Fair Value Disclosures (Textual) [Abstract] |  |  |  |  |  |  |
Debt instrument, stated rate | 4.50% |  | 4.50% | 4.50% |  |  |
4.50% senior notes [Member] | Level 2 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate Principal | $ 175,000,000 |  | $ 175,000,000 |  |  |  |
Fair value of fixed-rate debt |  |  |  |  |  |  |
Estimated Fair Value | $ 175,000,000 |  | $ 175,000,000 |  |  |  |
7.15% senior notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate Principal |  |  |  |  |  |  | $ 200,000,000
Fair Value Disclosures (Textual) [Abstract] |  |  |  |  |  |  |
Debt instrument, stated rate | 7.15% |  | 7.15% |  |  |  | 7.15%
7.15% senior notes [Member] | Level 2 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate Principal | $ 300,000,000 |  | $ 300,000,000 |  |  |  |
Fair value of fixed-rate debt |  |  |  |  |  |  |
Estimated Fair Value | $ 315,750,000 |  | $ 322,500,000 |  |  |  |
7.00% senior notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate Principal |  |  |  |  |  | $ 300,000,000 |
Fair Value Disclosures (Textual) [Abstract] |  |  |  |  |  |  |
Debt instrument, stated rate | 7.00% |  | 7.00% |  |  | 7.00% |
7.00% senior notes [Member] | Level 2 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate Principal | $ 300,000,000 |  | $ 300,000,000 |  |  |  |
Fair value of fixed-rate debt |  |  |  |  |  |  |
Estimated Fair Value | $ 313,500,000 |  | $ 318,000,000 |  |  |  |
6.00% senior notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate Principal |  | $ 200,000,000.0 |  |  |  |  |
Fair Value Disclosures (Textual) [Abstract] |  |  |  |  |  |  |
Debt instrument, stated rate | 6.00% | 6.00% | 6.00% |  |  |  |
6.00% senior notes [Member] | Level 2 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate Principal | $ 200,000,000 |  |  |  |  |  |
Fair value of fixed-rate debt |  |  |  |  |  |  |
Estimated Fair Value | $ 197,500,000 |  |  |  |  |  |
1.875% convertible senior notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate Principal |  |  |  |  | $ 126,500,000 |  |
Fair Value Disclosures (Textual) [Abstract] |  |  |  |  |  |  |
Debt instrument, stated rate | 1.875% |  | 1.875% |  | 1.875% |  |
1.875% convertible senior notes [Member] | Level 2 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate Principal | $ 126,500,000 |  | $ 126,500,000 |  |  |  |
Fair value of fixed-rate debt |  |  |  |  |  |  |
Estimated Fair Value | $ 124,128,000 |  | $ 124,444,000 |  |  |  |

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