INVESTMENTS: (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	$ 3,443	$ 2,675
Gross Unrealized Losses	(103)	(215)
Gross Unrealized Gains	10	2
Fair Value	3,350	2,462
Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	906	147
Gross Unrealized Losses	(2)	(2)
Gross Unrealized Gains	9	2
Fair Value	913	147
Government sponsored enterprise mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	101
Gross Unrealized Losses	0
Gross Unrealized Gains	1
Fair Value	102
Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	2,436	2,528
Gross Unrealized Losses	(101)	(213)
Gross Unrealized Gains	0	0
Fair Value	$ 2,335	$ 2,315