STOCK-BASED COMPENSATION PLANS: (Tables)

12 Months Ended

Dec. 31, 2014

STOCK-BASED COMPENSATION PLANS:

Schedule of changes in unvested restricted stock

	RSAs		Weighted-Average Price
Unvested shares at December 31, 2013	370,000		$	13.81
2014 Activity:
Granted	73,700		28.23
Vested	(214,000	)	13.52
Forfeited	—		—
Unvested shares at December 31, 2014	229,700		18.71

Schedule of assumptions used to estimate the value of SARs

	2014		2013		2012
Risk-free interest rate	1.5	%	0.9	%	0.9	%
Expected years until exercise	5 years		5 years		5 years
Expected volatility	65	%	73	%	73	%
Annual dividend yield	2.2	%	4.3	%	5.2	%

Summary of SARS Activity

	SARs	Weighted- Average Price
Outstanding at December 31, 2013	1,400,000	$	13.25
2014 Activity:
Granted	200,000	27.86
Exercised	—
Outstanding SARs at December 31, 2014	1,600,000	15.08

Schedule of assumptions used to estimate the value of stock options under ESPP

	2014
Risk-free interest rate	1.8	%
Expected years to exercise	5 years
Expected volatility	47.6	%
Annual dividend yield	2.3	%