SECURITIES REPURCHASE PROGRAM (Details) (USD $)	3 Months Ended		9 Months Ended		0 Months Ended	9 Months Ended		0 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Nov. 03, 2011 2011 Securities Repurchase Program	Sep. 30, 2012 2011 Securities Repurchase Program	Sep. 30, 2012 2011 Securities Repurchase Program 5.375% Convertible Notes due in August, 2014	Nov. 19, 2012 2012 Securities Repurchase Program	Sep. 30, 2013 2012 Securities Repurchase Program	Sep. 30, 2013 Director [Member]	Sep. 30, 2013 Director [Member]
Securities Repurchase Program
Aggregate maximum amount authorized under the Securities Repurchase Program					$ 1,500,000,000			$ 1,500,000,000
Aggregate principal amount of notes repurchased							1,100,000
Stated interest rate (as a percent)							5.375%
Aggregate purchase price of convertible notes							4,000,000
Carrying amount of convertible notes							1,000,000
Estimated fair value of convertible notes							1,100,000
Loss on extinguishment of debt	8,161,000	2,322,000	29,540,000	2,455,000			100,000
Difference between the estimated fair value and the repurchase price of securities							2,900,000
Difference between the estimated fair value and the purchase price of securities charged to additional paid-in capital							200,000
Difference between the estimated fair value and the purchase price of securities charged to accumulated deficit							2,700,000
Accreted interest on repurchase of convertible debt							100,000
Repurchase of convertible notes included in Consolidated cash flows as an outflow from financing activities	0	0	0	3,975,000			3,900,000
Common shares repurchased						5,257,454			507,957
Aggregate repurchase price of the entity's common shares repurchased	0	0	55,629,000	280,724,000		280,700,000			35,700,000		19,900,000
Excess of repurchase price over carrying value of securities repurchased, charged to accumulated deficit						$ 178,400,000			$ 25,800,000		$ 15,600,000
Shares repurchased	225,000									217,294	217,294