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DEBT (Details 2) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Debt    
Fixed-rate debt $ 484,463 $ 465,220
Variable-rate debt 285,577 161,313
Not recorded at fair value    
Debt    
Fixed-rate debt 382,929 362,602
Fair Value | Level 2    
Debt    
Fixed-rate debt 379,926 349,517
Carried at fair value    
Debt    
Variable-rate debt $ 101,500 $ 102,600