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INCOME TAXES: (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Federal:
Current	$ 0us-gaap_CurrentFederalTaxExpenseBenefit	$ 92us-gaap_CurrentFederalTaxExpenseBenefit	$ (639)us-gaap_CurrentFederalTaxExpenseBenefit
Deferred	31,402	21,084	29,120
State:
Current	558	1,319	(649)
Deferred	2,854	6,224	5,403
Provision for income taxes	$ 34,814us-gaap_IncomeTaxExpenseBenefit	$ 28,719us-gaap_IncomeTaxExpenseBenefit	$ 33,235us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.