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LONG-TERM OBLIGATIONS (Details) $ in Thousands | 1 Months Ended | 6 Months Ended
--- | --- | ---
Feb. 28, 2015 USD ($) | Dec. 31, 2014 USD ($) item | Jun. 30, 2015 USD ($)
Debt |  |  |
Proceeds from private placement |  | $ 475,000 |
Long-term obligations including current maturities |  | 607,584 | $ 831,129
Current maturities of long-term obligations |  | (18,692) | (18,122)
Long-term obligations |  | 588,892 | 813,007
Aggregate long-term maturities, excluding capital lease obligations |  |  |
2015 |  |  | 17,769
2016 |  |  | 50,391
2017 |  |  | 392
2018 |  |  | 75,342
2019 |  |  | 189
Thereafter |  |  | 685,161
Notes payable |  |  |
Debt |  |  |
Proceeds from debt | $ 225,000 | $ 250,000 |
Number of maturity tranches in funding of private placement | item |  | 2 |
Notes payable 0.61% - 27.26%, due in monthly and annual installments through 2027 |  |  |
Debt |  |  |
Long-term obligations including current maturities |  | $ 5,160 | $ 4,244
Interest rate on notes payable, low end of range (as a percent) |  |  | 0.61%
Interest rate on notes payable, high end of range (as a percent) |  |  | 27.26%
Senior unsecured notes 2.3%, due in 2015 |  |  |
Debt |  |  |
Long-term obligations including current maturities |  | 16,000 | $ 16,000
Interest rate on senior unsecured notes (as a percent) |  |  | 2.30%
Senior unsecured notes 6.0%, due in 2016 |  |  |
Debt |  |  |
Long-term obligations including current maturities |  | 50,000 | $ 50,000
Interest rate on senior unsecured notes (as a percent) |  |  | 6.00%
Senior unsecured notes 6.0%, due in 2018 |  |  |
Debt |  |  |
Long-term obligations including current maturities |  | 75,000 | $ 75,000
Interest rate on senior unsecured notes (as a percent) |  |  | 6.00%
Senior unsecured notes 3.8%, due in 2020 |  |  |
Debt |  |  |
Long-term obligations including current maturities |  | 84,000 | $ 84,000
Interest rate on senior unsecured notes (as a percent) |  |  | 3.80%
Senior unsecured notes 3.2%, due in 2022 |  |  |
Debt |  |  |
Long-term obligations including current maturities |  | 75,000 | $ 75,000
Interest rate on senior unsecured notes (as a percent) |  |  | 3.20%
Senior unsecured notes 3.5%, due in 2023 |  |  |
Debt |  |  |
Term of debt |  |  | 9 years
Long-term obligations including current maturities |  | 125,000 | $ 125,000
Interest rate on senior unsecured notes (as a percent) |  |  | 3.49%
Senior unsecured notes 3.4%, due in 2024 |  |  |
Debt |  |  |
Long-term obligations including current maturities |  | 50,000 | $ 50,000
Interest rate on senior unsecured notes (as a percent) |  |  | 3.40%
Senior unsecured notes 3.5%, due in 2024 |  |  |
Debt |  |  |
Term of debt |  |  | 9 years
Long-term obligations including current maturities |  |  | $ 100,000
Interest rate on senior unsecured notes (as a percent) |  |  | 3.49%
Senior unsecured notes 3.6%, due in 2025 |  |  |
Debt |  |  |
Term of debt |  |  | 11 years
Long-term obligations including current maturities |  | 125,000 | $ 125,000
Interest rate on senior unsecured notes (as a percent) |  |  | 3.61%
Senior unsecured notes 3.6%, due in 2026 |  |  |
Debt |  |  |
Term of debt |  |  | 11 years
Long-term obligations including current maturities |  |  | $ 125,000
Interest rate on senior unsecured notes (as a percent) |  |  | 3.61%
Capital lease obligations |  |  |
Debt |  |  |
Long-term obligations including current maturities |  | $ 2,424 | $ 1,885

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