SHARE-BASED COMPENSATION - Additional Information (Details) $ in Millions	6 Months Ended
Jun. 30, 2018 USD ($) perfconditions shares	Jun. 30, 2017 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding to officers, directors and key employees (in shares) \| shares	1,600,000
Total number of shares authorized to be issued under Equity Incentive Plan \| shares	450,000
Share-based compensation \| $	$ 7.0	$ 4.3
Employee service share-based compensation, nonvested awards, compensation not yet recognized, share-based awards other than options \| $	$ 17.5
Remaining weighted-average period	2 years 2 months 13 days
Stock and stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation \| $	$ 5.2	3.8
Award vesting period	4 years
Granted \| shares	40,000
Long-term performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation \| $	$ 1.8	$ 0.5
Long-term performance stock units \| CEO
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years
Granted \| shares	350,000
Vesting increment of performance units granted to CEO	20.00%
Number of stock price milestones	5
Common stock settlement period	30 days
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Award contractual term	10 years
October 15, 2015 [Member] \| Long-term performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Performance period	3 years
October 15, 2015 [Member] \| Long-term performance stock units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Possible payouts	0.00%
October 15, 2015 [Member] \| Long-term performance stock units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Possible payouts	300.00%
March 21, 2018 \| Long-term performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation award, number of performance conditions \| perfconditions	2
March 21, 2018 \| Long-term performance stock units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Possible payouts	0.00%
March 21, 2018 \| Long-term performance stock units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Possible payouts	200.00%
March 15, 2017 and March 21, 2018 \| Long-term performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	2 years
Performance period	2 years
March 15, 2017 \| Long-term performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation award, number of performance conditions \| perfconditions	3
Performance period	2 years
Relative total shareholder return \| March 15, 2017 \| Long-term performance stock units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Possible payouts	0.00%
Relative total shareholder return \| March 15, 2017 \| Long-term performance stock units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Possible payouts	200.00%
Company's results of operations \| March 15, 2017 \| Long-term performance stock units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Possible payouts	0.00%
Company's results of operations \| March 15, 2017 \| Long-term performance stock units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Possible payouts	300.00%

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Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Outstanding

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