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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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