NEW ACCOUNTING PRONOUNCEMENTS (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
New accounting pronouncements [Line Items]
Operating lease assets	$ 35,906	$ 44,372
Operating lease liabilities	11,589	12,898
Operating lease liabilities	28,344	33,585
Retained earnings	522,599	572,596
Cloud computing arrangements	29,242
ASU No. 2018-15 [Member]
New accounting pronouncements [Line Items]
Cloud computing arrangements	$ 29,242
Adoption of Accounting Standards Update [Member] | ASU No. 2016-02 [Member]
New accounting pronouncements [Line Items]
Operating lease assets			$ 50,803
Operating lease liabilities			13,611
Operating lease liabilities			$ 37,440
Adoption of Accounting Standards Update [Member] | ASU No. 2016-13 [Member]
New accounting pronouncements [Line Items]
Retained earnings		$ (3,640)