|
FAIR VALUE MEASUREMENTS (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2013
|
Mar. 31, 2014
U.S. treasury bills
|
Mar. 31, 2014
Total
|
Dec. 31, 2013
Total
|
Mar. 31, 2014
Total
Government securities money market
|
Dec. 31, 2013
Total
Government securities money market
|
Mar. 31, 2014
Total
U.S. treasury bills
|
Dec. 31, 2013
Total
U.S. treasury bills
|
Mar. 31, 2014
Total
Bank time deposits
|
Dec. 31, 2013
Total
Bank time deposits
|
Dec. 31, 2013
Total
Common Stock
|
Mar. 31, 2014
Level 2
|
Dec. 31, 2013
Level 2
|
Mar. 31, 2014
Level 2
Government securities money market
|
Dec. 31, 2013
Level 2
Government securities money market
|
Mar. 31, 2014
Level 2
U.S. treasury bills
|
Dec. 31, 2013
Level 2
U.S. treasury bills
|
Mar. 31, 2014
Level 2
Bank time deposits
|
Dec. 31, 2013
Level 2
Bank time deposits
|
Dec. 31, 2013
Level 3
|
Dec. 31, 2013
Level 3
Common Stock
|
|
| Fair value measurements | |||||||||||||||||||||
| Maximum investment term | 6 months | ||||||||||||||||||||
| Cash and cash equivalents | $ 77,006 | $ 73,366 | $ 119,480 | $ 146,991 | $ 40,484 | $ 40,468 | $ 77,006 | $ 73,366 | $ 119,480 | $ 146,991 | $ 40,484 | $ 40,468 | |||||||||
| Total investments in securities | 68,141 | 68,141 | 66,237 | 1,904 | 66,237 | 66,237 | 1,904 | 1,904 | |||||||||||||
| Total financial assets | $ 236,970 | $ 328,966 | $ 236,970 | $ 327,062 | $ 1,904 | ||||||||||||||||