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SENIOR AND CONVERTIBLE SENIOR NOTES - Narrative (Details) - USD ($) | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Sep. 30, 2012 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Jun. 02, 2015 | Nov. 30, 2013 | Mar. 13, 2013 | Apr. 30, 2012 | Dec. 31, 2010
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of wholly owned subsidiary |  |  | 100.00% |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  | $ 0 | $ 0 | $ (3,796,000) |  |  |  |  |
Senior Notes [Member] | 7.731% senior subordinated notes due 2017 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt | $ 3,800,000 |  |  |  |  |  |  |  |  |
Senior Notes [Member] | 4.50% senior notes due 2018 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of offering | $ 175,000,000 |  |  |  |  |  |  |  |  |
Debt instrument, stated rate | 4.50% |  | 4.50% | 4.50% |  |  |  |  |  |
Senior Notes [Member] | 7.15% senior notes due 2020 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of offering |  |  |  |  |  |  |  |  |  | $ 200,000,000
Debt instrument, stated rate |  |  | 7.15% | 7.15% |  |  |  |  |  | 7.15%
Percent of debt instrument par value issued |  |  |  |  |  |  | 106.699% |  |  | 97.567%
Add-on to existing 7.15% senior notes |  |  |  |  |  |  | $ 100,000,000 |  |  |
Effective percentage of debt instrument |  |  |  |  |  |  | 5.875% |  |  | 7.50%
Senior Notes [Member] | 7.00% senior notes due 2022 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of offering |  |  |  |  |  |  |  |  | $ 300,000,000 |
Debt instrument, stated rate |  |  | 7.00% | 7.00% |  |  |  |  | 7.00% |
Senior Notes [Member] | 7.731% senior subordinated notes due 2017 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, stated rate |  |  |  |  |  |  |  | 7.731% | 7.731% |
Aggregate principal amount repurchased | $ 99,800,000 |  |  |  |  |  |  |  | $ 26,100,000 |
Senior Notes [Member] | 1.875% convertible senior notes due 2032 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of offering |  | $ 126,500,000 |  |  |  |  |  |  |  |
Debt instrument, stated rate |  | 1.875% | 1.875% | 1.875% |  |  |  |  |  |
Debt instrument, convertible, conversion ratio |  | 0.0171985 |  |  |  |  |  |  |  |
Debt instrument, convertible, conversion price |  | $ 58.14 |  |  |  |  |  |  |  |
Debt instrument, convertible, conversion premium |  | 47.50% |  |  |  |  |  |  |  |
Percentage of principal in the event of a repurchase |  | 100.00% |  |  |  |  |  |  |  |
Senior Notes [Member] | 1.875% convertible senior notes due 2032 [Member] | Fifth anniversary [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, convertible, conversion price |  | $ 58.14 |  |  |  |  |  |  |  |
Senior Notes [Member] | 1.875% convertible senior notes due 2032 [Member] | Tenth anniversary [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, convertible, conversion price |  | 58.14 |  |  |  |  |  |  |  |
Senior Notes [Member] | 1.875% convertible senior notes due 2032 [Member] | Fifteenth anniversary [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, convertible, conversion price |  | $ 58.14 |  |  |  |  |  |  |  |
Senior Notes [Member] | 6.25% senior notes due 2015 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, stated rate |  |  |  |  |  |  |  |  | 6.25% |
Aggregate principal amount repurchased |  |  |  |  |  |  |  |  | $ 285,000,000 |
Senior Notes [Member] | 6.00% senior notes due 2025 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of offering |  |  |  |  |  | $ 200,000,000.0 |  |  |  |
Debt instrument, stated rate |  |  | 6.00% | 6.00% |  | 6.00% |  |  |  |

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