FOREIGN OPERATIONS: (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Financial information by geographic area
Revenues	$ 277,208	$ 277,873	$ 276,271	$ 266,193	$ 277,131	$ 273,102	$ 277,467	$ 271,659	$ 1,097,545	$ 1,099,359	$ 1,130,624
Long-lived assets excluding financial instruments	657,776				726,610				657,776	726,610
United States
Financial information by geographic area
Revenues									949,898	954,467	969,961
Long-lived assets excluding financial instruments	617,668				654,550				617,668	654,550
Foreign
Financial information by geographic area
Revenues									147,647	144,892	160,663
Long-lived assets excluding financial instruments	40,108				72,060				40,108	72,060
Europe
Financial information by geographic area
Revenues									108,561	105,278	118,278
Long-lived assets excluding financial instruments	13,886				42,690				13,886	42,690
Asia/ Pacific
Financial information by geographic area
Revenues									34,540	34,876	36,158
Long-lived assets excluding financial instruments	24,912				28,139				24,912	28,139
Other
Financial information by geographic area
Revenues									4,546	4,738	6,227
Long-lived assets excluding financial instruments	$ 1,310				$ 1,231				$ 1,310	$ 1,231