INCOME TAXES: (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Unrecognized Tax Benefits	$ 5,071,000	$ 5,780,000	$ 5,822,000	$ 6,326,000
Valuation Allowance, Amount	279,600,000	244,900,000	230,400,000
Unrecognized Tax Benefits That Would Impact Effective Tax Rate	3,300,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	35.00%
Domestic Tax Authority [Member]
Operating Loss Carryforwards	716,800,000
Domestic Tax Authority [Member] | Minimum [Member]
Open Tax Year	2009
Domestic Tax Authority [Member] | Maximum [Member]
Open Tax Year	2012
State and Local Jurisdiction [Member]
Operating Loss Carryforwards	697,800,000
Unrecognized Tax Benefits Resulting In Net Operating Loss Carryforward	57,100,000
State and Local Jurisdiction [Member] | Minimum [Member]
Open Tax Year	2008
State and Local Jurisdiction [Member] | Maximum [Member]
Open Tax Year	2012
City Jurisdiction [Member]
Operating Loss Carryforwards	$ 179,900,000