SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	$ 857,204		$ 916,971
Cumulative effect adjustments			(88,594)
Difference between Revenue Guidance in Effect before and after Topic 606 | ASU No. 2014-09 - Revenue from Contracts with Customers
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings		$ (88,600)
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustments			(78,042)
Retained Earnings | ASU No. 2016-01 - Financial Instruments - Recognition and Measurement of Financial Assets and Financial Liabilities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustments		10,600
Accumulated Other Comprehensive Income (Loss)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustments			$ (10,552)
Accumulated Other Comprehensive Income (Loss) | ASU No. 2016-01 - Financial Instruments - Recognition and Measurement of Financial Assets and Financial Liabilities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustments		$ (10,600)