GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS, Schedule of Goodwill and Net Identifiable Intangible Asset Balances (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 295,486	$ 295,486	$ 295,486	$ 295,486	$ 295,486	$ 295,486
Identifiable intangible assets, net	55,187		58,775
Total goodwill and identifiable intangible assets, net	$ 350,673		$ 354,261