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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Mar. 31, 2015
Levels of fair value measurements of financial assets:    
Restricted cash $ 6,751 $ 6,751
Fair Value, Measurements, Recurring [Member]    
Levels of fair value measurements of financial assets:    
Restricted cash 6,751 6,751
Interest rate derivatives 172 28
Financial assets 6,923 6,959
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1    
Levels of fair value measurements of financial assets:    
Restricted cash 6,751 6,751
Interest rate derivatives 0 0
Financial assets 6,751 6,751
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2    
Levels of fair value measurements of financial assets:    
Restricted cash 0 0
Interest rate derivatives 172 208
Financial assets 172 208
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3    
Levels of fair value measurements of financial assets:    
Restricted cash 0 0
Interest rate derivatives 0 0
Financial assets $ 0 $ 0