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LONG-TERM DEBT Senior Notes (Details) (USD $)
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9 Months Ended | ||||||||
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Sep. 30, 2013
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Aug. 31, 2013
Add-on 7% Senior Notes Due 2020 [Member]
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Sep. 30, 2013
7% Senior Notes Due 2020 [Member]
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Aug. 31, 2013
7% Senior Notes Due 2020 [Member]
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Dec. 31, 2012
7% Senior Notes Due 2020 [Member]
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Sep. 30, 2013
7% Senior Notes Due 2020 [Member]
Prior to September 1, 2016 [Member]
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Sep. 30, 2013
7% Senior Notes Due 2020 [Member]
Redemption, Equity Offering [Member]
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Sep. 30, 2013
7% Senior Notes Due 2020 [Member]
After September 1, 2016 [Member]
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Sep. 30, 2013
7% Senior Notes Due 2020 [Member]
Redemption, Defined Changes of Control [Member]
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| Debt Instrument [Line Items] | |||||||||
| Interest rate, stated percentage | 7.00% | 7.00% | 7.00% | ||||||
| Debt premium | $ 8,893,000 | $ 9,000,000 | $ 8,893,000 | ||||||
| Face amount | $ 200,000,000 | $ 425,000,000 | |||||||
| Percentage of notes which may be redeemed | 35.00% | ||||||||
| Redemption price, percentage | 100.00% | 107.00% | 103.50% | 101.00% | |||||
| Basis spread on make whole premium | 0.50% | ||||||||