INVESTMENTS: (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Amortized Cost Basis	$ 3,367	$ 1,597
Gross Unrealized Losses	(111)	(11)
Gross Unrealized Gains	9	108
Fair Value	3,265	1,694
Corporate Debt Securities [Member]
Amortized Cost Basis	1,047	85
Gross Unrealized Losses	(14)	0
Gross Unrealized Gains	9	107
Fair Value	1,042	192
Mutual Funds [Member]
Amortized Cost Basis	2,320	1,512
Gross Unrealized Losses	(97)	(11)
Gross Unrealized Gains	0	1
Fair Value	$ 2,223	$ 1,502