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COMMITMENTS AND CONTINGENCIES COMMITMENTS AND CONTINGENCIES - Defined Contribution Pension Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Matching contributions and certain other benefits	$ 0.3	$ 0.3
Percentage of additional employer matching contribution	50.00%	50.00%
Percentage of annual contributions per employee	4.00%	4.00%

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- References

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

+ References

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Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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