STOCK-BASED COMPENSATION (PREDECESSOR COMPANY) - Performance Shares and Stock Appreciation Rights (Details) - Predecessor $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016 installment	Dec. 31, 2014 USD ($) award $ / shares shares
Performance Shares
Stock-based compensation
Period over which average return on average equity is calculated (in years)		3 years
Minimum percentage of Company's ROE to earn awards under performance awards		10.50%
Number of awards earned when ROE is below specified criteria | award		0
Minimum percentage of Company's ROE to earn maximum awards under performance awards		12.00%
Number of shares of common stock assumed to be payable with respect to each outstanding award (in shares)		1
Awards issued (in shares)		203,295
Estimated fair value of performance shares awarded | $		$ 10,484
Assumptions used in the model for SARs granted
Awards issued (in shares)		203,295
Stock Appreciation Rights
Stock-based compensation
Awards issued (in shares)		0
Exercisable period of grants from grant date	5 years
Beginning of annual installments from date of grant	1 year
Expiration period from date of grant	10 years
Balance at December 31, 2014 (in dollars per share) | $ / shares		$ 30.41
Balance at December 31, 2014 (in shares)		157,628
Assumptions used in the model for SARs granted
Awards issued (in shares)		0
Expected volatility rate (as a percent)		69.40%
Expected risk-free interest rate (as a percent)		2.60%
Expected dividend rate (as a percent)		2.40%
Expected forfeiture rate (as a percent)		0.00%
Stock Appreciation Rights | Minimum
Stock-based compensation
Number of annual installments to exercise stock appreciation rights | installment	3
Stock Appreciation Rights | Maximum
Stock-based compensation
Number of annual installments to exercise stock appreciation rights | installment	4