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LONG-TERM DEBT - Summary of Long-Term Debt (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017	Apr. 06, 2015
Debt Instrument [Line Items]
Par Value	$ 175,000,000	$ 175,000,000
Unamortized Debt Issuance Cost and Discount	$ (1,904,000)	(2,059,000)
Senior Notes | 5.25% Senior Notes Due April 15, 2025
Debt Instrument [Line Items]
Stated interest rate	5.25%		5.25%
Par Value	$ 175,000,000	175,000,000	$ 175,000,000
Unamortized Debt Issuance Cost and Discount	$ (1,904,000)	$ (2,059,000)

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

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Contractual interest rate for funds borrowed, under the debt agreement.

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