INVESTMENT IN AFFILIATED COMPANY: (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2010
Net revenue	$ 107,268
Costs and expenses	87,648
Earnings from continuing operations	19,620
Net income	19,620
Current assets	45,074
Non-current assets	116,901
Current liabilities	112,894
Non-current liabilities	24,899
Equity	$ 24,182