STOCKHOLDERS' EQUITY (Schedule of Stock by Class) (Details) - $ / shares	Dec. 31, 2018	Dec. 31, 2017	Sep. 23, 2016	Sep. 22, 2016
Stockholders' Equity Note [Abstract]
Common stock, par value (in dollars per share)	$ 0.000001	$ 0.000001
Common Stock, Shares Authorized (in shares)	200,000,000	200,000,000	200,000,000	500,000,000
Common Stock, Shares Issued (in shares)	81,996,839	83,724,916
Common Stock, Shares Outstanding (in shares)	81,996,839	83,724,916
Undesignated Preferred Stock, Shares Authorized (in shares)	10,000,000	10,000,000
Undesignated Preferred Stock, Shares Issued (in shares)	0	0
Undesignated Preferred Stock, Shares Outstanding (in shares)	0	0