SIGNIFICANT ACCOUNTING POLICIES AND OTHER INFORMATION (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Geographic Information
Revenues	$ 251,017	$ 295,277	$ 263,633	$ 238,310	$ 250,551	$ 283,891	$ 267,401	$ 243,352	$ 1,048,237	$ 1,045,195	$ 1,054,040
Countries other than US | Foreign subsidiaries
Geographic Information
Revenues									59,703	58,041	55,956
Long-lived assets	$ 36,192				$ 36,233				$ 36,192	$ 36,233