OTHER ASSETS, NET (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Other assets, net of accumulated amortization
Advances for long-term purchase contracts	$ 28,249	$ 31,154
Investment in joint ventures	5,966	6,419
Deferred financing costs, net	17,904	18,740
Long-term assets held for sale	16,050	14,750
Other	4,239	4,538
Total other assets, net	$ 72,408	$ 75,601