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INVESTMENTS (Details 3) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Available-for-sale, Amortized Cost  
Within 1 year $ 296,062
After 1 year through 5 years 226,509
Total 522,571
Available-for-sale, Estimated Fair Value  
Within 1 year 296,166
After 1 year through 5 years 226,658
Total 522,824
Held-to-maturity, Amortized Cost  
Within 1 year 1,547
Total 1,547
Held-to-maturity, Estimated Fair Value  
Within 1 year 1,547
Estimated Fair Value $ 1,547