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DEBT (Details) - USD ($)	1 Months Ended		3 Months Ended	6 Months Ended
	Apr. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Debt
Line of Credit Facility, Fair Value of Amount Outstanding				$ 62,595,000	$ 68,166,000
Revolving credit agreement
Debt
Borrowing capacity under the line of credit				$ 400,000,000
Line of Credit Facility, Initiation Date		Sep. 12, 2014
Covenant compliance description				As of June 30, 2015, the Company was in compliance with all of its covenants
Line of Credit Facility, Fair Value of Amount Outstanding				$ 40,000,000
Additional increase in borrowing capacity of the line of credit available at the entity's option				$ 100,000,000
Debt Instrument, Term				5 years
Senior Notes [Member]
Debt
Debt Instrument, Issuance Date	Apr. 01, 2015
Debt Instrument, Face Amount				$ 350,000,000
Proceeds from Issuance of Unsecured Debt				$ 150,000,000
Debt, Weighted Average Interest Rate				3.50%
AverageMaturityofDebtInstruments				19 years
Debt Instrument, Covenant Compliance				As of June 30, 2015, the Company was in compliance with all of its debt covenants
Minimum [Member] | Senior Notes [Member]
Debt
Debt Instrument, Term				10 years
Maximum | Senior Notes [Member]
Debt
Debt Instrument, Term				30 years
Senior Notes Series A [Member]
Debt
Debt Instrument, Maturity Date				Aug. 20, 2025
Debt Instrument, Interest Rate, Stated Percentage				3.15%
Debt Instrument, Face Amount				$ 100,000,000
Senior Notes Series B [Member]
Debt
Debt Instrument, Maturity Date				Aug. 20, 2030
Debt Instrument, Interest Rate, Stated Percentage				3.35%
Debt Instrument, Face Amount				$ 100,000,000
Senior Notes Series C [Member]
Debt
Debt Instrument, Maturity Date				Apr. 01, 2035
Debt Instrument, Interest Rate, Stated Percentage				3.61%
Debt Instrument, Face Amount				$ 50,000,000
Senior Notes Series D [Member]
Debt
Debt Instrument, Maturity Date				Apr. 01, 2045
Debt Instrument, Interest Rate, Stated Percentage				4.02%
Debt Instrument, Face Amount				$ 100,000,000
Subsequent Event [Member] | Senior Notes [Member]
Debt
Proceeds from Issuance of Unsecured Debt			$ 200,000,000

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States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure.

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