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COMMITMENTS AND CONTINGENCIES (Tables)
 6 Months Ended
Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract]  
Deferred FI implementation costs
The following table summarizes changes in deferred FI implementation costs (in thousands):
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2019
 
2020
 
2019
 
2020
Beginning balance
$
14,067

 
$
7,375

 
$
15,877

 
$
8,383

Recoveries through FI Share
(1,155
)
 
—

 
(2,312
)
 
—

Amortization
(731
)
 
(991
)
 
(1,384
)
 
(1,999
)
Ending balance
$
12,181

 
$
6,384

 
$
12,181

 
$
6,384