EARNINGS (LOSS) PER SHARE AND STOCKHOLDERS' EQUITY: Narrative (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	20	709
Treasury stock, at cost	$ (1,046,648)		$ (1,039,345)
Accumulated other comprehensive income	$ 8,651		$ 7,999
Stock Options And Warrants And Restricted Stock Units
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	2,800
Common Stock Repurchase Program
Stock Repurchase Program, Authorized Amount	$ 400,000
Repurchase of stock (in shares)	16,800
Treasury stock, at cost	$ (285,700)
Stock repurchase program, remaining amount	$ 114,300