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LONG-TERM DEBT - Summary of Long-term Debt (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Apr. 15, 2016	Apr. 06, 2015	Aug. 15, 2014	May 21, 2014
Debt Instrument [Line Items]
Par Value	$ 175,000,000	$ 175,000,000
Unamortized Debt Issuance Cost and Discount	(1,826,000)	(2,059,000)
Senior Notes | 5.25% Senior Notes Due April 15, 2025
Debt Instrument [Line Items]
Stated interest rate				5.25%
Par Value	175,000,000	175,000,000		$ 175,000,000
Unamortized Debt Issuance Cost and Discount	$ (1,826,000)	$ (2,059,000)
Junior Subordinated Debt | 7.50% Amortizing Note Due May 15, 2017
Debt Instrument [Line Items]
Stated interest rate			7.50%		7.50%	7.50%

X

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Face (par) amount of debt instrument at time of issuance.

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