LONG-TERM INVESTMENTS (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Components of long-term investments
Long-term investments	$ 114,983	$ 179,990
Cost method investments
Components of long-term investments
Long-term investments	90,910	137,286
Equity method investments
Components of long-term investments
Long-term investments	10,593	22,073
Marketable equity security
Components of long-term investments
Long-term investments	7,410	11,711
Auction rate security
Components of long-term investments
Long-term investments	$ 6,070	$ 8,920