INTEREST EXPENSE (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Interest expense, debt	$ 107,670	$ 111,948	$ 101,201
Amortization of capitalized debt issuance costs	14,101	6,226	5,706
Amortization of debt issuance discount and premium	5,999	17,379	21,299
Loss on extinguishment	198	25,904	5,299
Total debt related expenses	20,298	49,509	32,304
Total interest expense	127,968	161,457	133,505
Interest on Senior Notes [Member]
Interest expense, debt	87,859	89,747	75,783
Interest on Convertible Notes [Member]
Interest expense, debt	15,364	18,034	16,378
Interest on capital leases and other financing arrangements [Member]
Interest expense, debt	$ 4,447	$ 4,167	$ 9,040