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FAIR VALUE MEASUREMENT (Tables)
 12 Months Ended
Dec. 31, 2014
Fair Value Disclosures [Abstract]  
Schedule of cost aggregate fair value and unrealized holding gains and losses by major security
​ ​ ​
As of December 31, 2013
 ​
​ ​ ​
Cost
 ​ ​
Aggregate
fair value
 ​ ​
Unrealized
gains, net
 ​
​ ​ ​
U.S. dollars in thousands
 ​
Government and corporate debentures
 ​ ​ ​ ​ 45,518 ​ ​ ​ ​ ​ 46,114 ​ ​ ​ ​ ​ 596 ​ ​
Other (equity securities)
 ​ ​ ​ ​ 588 ​ ​ ​ ​ ​ 604 ​ ​ ​ ​ ​ 16 ​ ​
​ ​ ​ ​ ​ 46,106 ​ ​ ​ ​ ​ 46,718 ​ ​ ​ ​ ​ 612 ​ ​
​
 
Schedule of contractual maturities of investments in available for sale debt securities
​ ​ ​
Fair Value as of
December 31,
2014
 ​
Due in 1 year
 ​ ​ ​ ​ 7,732 ​ ​
Due in 2 years
 ​ ​ ​ ​ 8,011 ​ ​
Due in 3 years
 ​ ​ ​ ​ 5,726 ​ ​
Due in 4 years
 ​ ​ ​ ​ 6,112 ​ ​
Due in 5 years
 ​ ​ ​ ​ 3,773 ​ ​
Due after 5 years
 ​ ​ ​ ​ 1,541 ​ ​
​ ​ ​ ​ ​ 32,895 ​ ​
​