INTEREST EXPENSE (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Interest expense, debt	$ 29,038	$ 27,043
Amortization of capitalized debt issuance costs	1,144	1,223
Amortization of debt issuance discount and premium, net	1,836	3,558
Total debt related expenses	2,980	4,781
Total interest expense	32,018	31,824
Interest on Senior Notes [Member]
Interest expense, debt	25,485	21,192
Interest on Convertible Notes [Member]
Interest expense, debt	3,412	4,397
Interest on capital leases and other financing arrangements [Member]
Interest expense, debt	$ 141	$ 1,454