RESTRICTED INVESTMENTS AND BOND COLLATERAL - Maturities of Available-for-Sale Securities (Details) (Restricted Investments and Bond Collateral, USD $) In Thousands, unless otherwise specified	Mar. 31, 2015
Restricted Investments and Bond Collateral
Schedule of Available-for-sale Securities [Line Items]
Due within one year, Amortized Cost Basis	$ 391
Due in five years or less, Amortized Cost Basis	12,262
Due after five years to ten years, Amortized Cost Basis	12,953
Due in more than ten years, Amortized Cost Basis	8,606
Available-for-sale Securities, Amortized Cost Basis	34,212
Due within one year, Fair Value	378
Due in five years or less, Fair Value	12,424
Due after five years to ten years, Fair Value	12,993
Due in more than ten years, Fair Value	8,796
Available-for-sale Securities, Fair Value	$ 34,591