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FAIR VALUE MEASUREMENTS: (Details 2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Available for Sale: |  |
Amortized Cost | $ 118,562 | $ 92,629
Fair Value | 118,647 | 94,053
Unrealized Gains | 134 | 1,462
Unrealized Losses | (49) | (38)
Auction rate securities | 118,647 | 94,053
Auction rate security |  |
Available for Sale: |  |
Amortized Cost |  | 8,410
Fair Value |  | 9,485
Unrealized Gains |  | 1,075
Auction rate securities |  | 9,485
Municipal bonds |  |
Available for Sale: |  |
Amortized Cost | 75,488 | 65,745
Fair Value | 75,622 | 66,002
Unrealized Gains | 134 | 257
Auction rate securities | 75,622 | 66,002
Corporate bonds |  |
Available for Sale: |  |
Amortized Cost | 37,258 | 14,614
Fair Value | 37,214 | 14,744
Unrealized Gains |  | 130
Unrealized Losses | (44) |
Auction rate securities | 37,214 | 14,744
Certificates of deposit |  |
Available for Sale: |  |
Amortized Cost | 5,796 | 3,840
Fair Value | 5,794 | 3,805
Unrealized Losses | (2) | (35)
Auction rate securities | 5,794 | 3,805
Mutual funds |  |
Available for Sale: |  |
Amortized Cost | 20 | 20
Fair Value | 17 | 17
Unrealized Losses | (3) | (3)
Auction rate securities | $ 17 | $ 17

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