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STOCK-BASED COMPENSATION: (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		1 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012 Market-based restricted stock units
Stock-Based Compensation
Shares authorized under stock incentive plan			309,287
Aggregate compensation cost	$ 3.3	$ 2.9
Recognized tax benefits related to stock options	$ 0.4	$ 0.4

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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