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COMMITMENTS AND CONTINGENCIES (Tables)
 3 Months Ended
Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Deferred FI implementation costs
The following table presents changes in deferred FI implementation costs (in thousands):
 
Three Months Ended
March 31,
 
2017
 
2018
Beginning balance
$
8,451

 
$
13,625

Deferred costs
—

 
250

Recoveries through FI Share, net of accumulated amortization
(963
)
 
(1,344
)
Amortization
(391
)
 
(412
)
Ending balance
$
7,097

 
$
12,119