INCOME TAXES: (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Provision for income taxes - continuing operations	$ 97,432	$ 41,249	$ 67,852
(Benefit) provision for income taxes - discontinued operations	0	(10,806)	(663)
Income tax expense (benefit)	97,432	30,443	68,515
Current:
Federal	92,609	16,229	56,106
State	5,641	(8,305)	4,095
Current income tax expense (benefit)	98,250	7,924	60,201
Deferred:
Federal	3,170	20,214	9,151
State	(3,988)	2,305	(837)
Deferred income tax expense (benefit)	(818)	22,519	8,314
Income tax expense (benefit)	$ 97,432	$ 30,443	$ 68,515