DEBT Narrative (Details) (USD $)	9 Months Ended			3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended			0 Months Ended	3 Months Ended	9 Months Ended	0 Months Ended	3 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Senior Exchangeable Notes Due 2012 at a fixed interest rate of 3.75% [Member]	Sep. 30, 2013 Senior Exchangeable Notes due 2015 at a fixed interest rate of 4.50% [Member] note_holder redemption	Sep. 30, 2013 Senior Exchangeable Notes due 2015 at a fixed interest rate of 4.50% [Member] redemption	Sep. 30, 2013 Senior Exchangeable Notes due 2015 - Settlements 1 and 2 [Member]	Sep. 30, 2013 Senior Exchangeable Notes due 2015 - Settlements 1 and 2 [Member]	Sep. 30, 2013 Term Credit Agreement due 2019 [Member]	Sep. 30, 2013 April 2011 Line of Credit as Amended October 2012 [Member]	Apr. 06, 2013 Warrants on Senior Exchangeable Notes due 2012 [Member]	Mar. 31, 2013 Warrants on Senior Exchangeable Notes due 2012 [Member]	Sep. 30, 2013 Warrants on Senior Exchangeable Notes due 2012 [Member] unit	Oct. 03, 2013 Subsequent Event [Member] Senior Exchangable Notes due 2015 - Third Settlement [Member]	Dec. 31, 2013 Subsequent Event [Member] Senior Exchangable Notes due 2015 - Third Settlement [Member]
Debt Instrument [Line Items]
Stated interest rate			3.75%	4.50%	4.50%
Beginning Date for Maturity of Warrants												Jan. 15, 2013
Ending Date for Maturity of Warrants												Mar. 27, 2013
Total Number of Warrants												8,313,511
Number of Warrants Settled												8,313,511
Shares issued on conversion of warrants										97,918	2,037,303	2,135,221
Debt Instrument, Exchange Feature, Exchange Period, Beginning Date				Sep. 30, 2013	Jun. 30, 2013
Face Amount				$ 172,500,000	$ 172,500,000
Maturity date					2015
Debt Instrument, Exchange Feature, Exchange Period, End Date				Dec. 31, 2013	Sep. 30, 2013
Debt Instrument, Exchange Feature, Description					According to the indenture, in order for the notes to become exchangeable, the Company’s stock price must exceed 130 percent of the exchange price for 20 trading days during a period of 30 consecutive trading days as of the last day of the quarter.
Percent of the exchange price the stock price must exceed					130.00%
Trading day threshold					20 days
Number of trading days for stock price					30 days
Number of note holder groups				3
Principal amount redeemed				41,500,000
Number of redemptions settled				2	2
Redemption amount settled							31,500,000						10,000,000
Loss on Extinguishment of Debt	3,017,000	0				3,000,000								1,000,000
Line of Credit Facility, Increase (Decrease) for Period, Net									0
Line of Credit Facility, Maximum Borrowing Capacity									450,000,000
Line of Credit Facility, Remaining Borrowing Capacity									172,000,000
Line of Credit Facility, Amount to Secure Letters of Credit									3,000,000
Debt Instrument, Increase, Additional Borrowings								200,000,000
Debt Instrument, Unused Borrowing Capacity, Amount								$ 140,000,000