OTHER ASSETS, NET (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Other assets, net of accumulated amortization
Advances for long-term purchase contracts	$ 25,376	$ 31,154
Investment in joint ventures	5,679	6,419
Deferred financing costs, net	16,925	18,740
Long-term assets held for sale	14,070	14,750
Other	4,385	4,538
Total other assets, net	$ 66,435	$ 75,601