INTEREST EXPENSE (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Interest expense, debt	$ 28,355	$ 25,774	$ 57,393	$ 52,818
Amortization of capitalized debt issuance costs	1,146	6,945	2,290	8,167
Amortization of debt issuance discount and premium, net	1,687	(1,590)	3,523	1,968
Gains (Losses) on Extinguishment of Debt	23,115	(448)	23,115	(448)
Total debt related expenses	2,833	5,355	5,813	10,135
Total interest expense	31,188	31,129	63,206	62,953
Interest on Senior Notes [Member]
Interest expense, debt	24,930	19,981	50,413	41,173
Interest on Convertible Notes [Member]
Interest expense, debt	3,263	4,077	6,675	8,475
Interest on capital leases and other financing arrangements [Member]
Interest expense, debt	$ 162	$ 1,716	$ 305	$ 3,170