NATURE OF OPERATIONS, CONSOLIDATION AND PRESENTATION OF FINANCIAL STATEMENTS - Recently Issued Accounting Pronouncements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other assets	$ 54,145	$ 49,130
Deferred tax assets	35,794	56,064
Retained earnings	119,550	204
Tax benefit from stock options exercised and restricted stock vesting	$ 0	0	$ 7,241
ASU 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Tax benefit from stock options exercised and restricted stock vesting		3,200
ASU 2016-09 [Member] | Restatement Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred tax assets		400
Retained earnings		$ 400
ASU 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liabilities				$ 80,000
Operating Lease, Right-of-Use Asset				$ 80,000