SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Impact of New Accounting Standards) (Details) - USD ($) $ in Thousands	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings		$ 109,508	$ 277,912
Proforma Adjustment | Accounting Standards Update 2014-09 | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	$ 70,000
Proforma Adjustment | Accounting Standards Update 2014-09 | Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	$ 90,000