UNEARNED REVENUE (Tables)
|12 Months Ended|
Dec. 31, 2018
|Revenue from Contract with Customer [Abstract]|
|Changes in unearned revenue||
Changes in unearned revenue were as follows:
Tabular disclosure of contract balances and changes in contract balances.
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
No definition available.