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DEBT (Details) $ in Thousands | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2015 USD ($) | Dec. 31, 2014 USD ($) item | Jun. 30, 2016 USD ($) | Dec. 31, 2015 USD ($)
Debt |  |  |  |
Proceeds from private placement |  | $ 475,000 |  |
Number of maturity tranches in funding of private placement | item |  | 2 |  |
Long-term obligations gross including current maturities |  |  | $ 826,602 | $ 814,413
Current maturities of long-term obligations |  |  | (53,344) | (51,889)
Total long-term obligations |  |  | 773,258 | 762,524
Deferred Finance Costs, Net, Total |  |  | 1,563 | 1,681
Deferred debt issuance costs current |  |  |  | (5)
Deferred debt issuance costs noncurrent |  |  | 1,563 | 1,676
Long-term obligations including current maturities |  |  | 825,039 | 812,732
Current maturities of long-term obligations |  |  | (53,344) | (51,884)
Long-term obligations |  |  | 771,695 | 760,848
Aggregate long-term maturities, excluding capital lease obligations |  |  |  |
2016 |  |  | 52,691 |
2017 |  |  | 2,546 |
2018 |  |  | 77,547 |
2019 |  |  | 1,918 |
2020 |  |  | 85,794 |
Thereafter |  |  | 604,174 |
Notes payable |  |  |  |
Debt |  |  |  |
Proceeds from debt | $ 225,000 | $ 250,000 |  |
Notes payable 0.61% - 16.00%, due in monthly and annual installments through 2025 |  |  |  |
Debt |  |  |  |
Long-term obligations gross including current maturities |  |  | 15,670 | 3,785
Long-term obligations including current maturities |  |  | $ 15,670 | $ 3,785
Interest rate on notes payable, low end of range (as a percent) |  |  | 0.61% | 0.61%
Interest rate on notes payable, high end of range (as a percent) |  |  | 16.00% | 14.50%
Senior unsecured notes 6.0%, due in 2016 |  |  |  |
Debt |  |  |  |
Long-term obligations gross including current maturities |  |  | $ 50,000 | $ 50,000
Deferred Finance Costs, Net, Total |  |  |  | 5
Long-term obligations including current maturities |  |  | $ 50,000 | $ 49,995
Interest rate on senior unsecured notes (as a percent) |  |  | 6.00% | 6.00%
Senior unsecured notes 6.0%, due in 2018 |  |  |  |
Debt |  |  |  |
Long-term obligations gross including current maturities |  |  | $ 75,000 | $ 75,000
Deferred Finance Costs, Net, Total |  |  | 50 | 63
Long-term obligations including current maturities |  |  | $ 74,950 | $ 74,937
Interest rate on senior unsecured notes (as a percent) |  |  | 6.00% | 6.00%
Senior unsecured notes 3.8%, due in 2020 |  |  |  |
Debt |  |  |  |
Long-term obligations gross including current maturities |  |  | $ 84,000 | $ 84,000
Deferred Finance Costs, Net, Total |  |  | 135 | 150
Long-term obligations including current maturities |  |  | $ 83,865 | $ 83,850
Interest rate on senior unsecured notes (as a percent) |  |  | 3.80% | 3.80%
Senior unsecured notes 3.2%, due in 2022 |  |  |  |
Debt |  |  |  |
Long-term obligations gross including current maturities |  |  | $ 75,000 | $ 75,000
Deferred Finance Costs, Net, Total |  |  | 151 | 163
Long-term obligations including current maturities |  |  | $ 74,849 | $ 74,837
Interest rate on senior unsecured notes (as a percent) |  |  | 3.20% | 3.20%
Senior unsecured notes 3.5%, due in 2023 |  |  |  |
Debt |  |  |  |
Term of debt |  | 9 years |  |
Long-term obligations gross including current maturities |  |  | $ 125,000 | $ 125,000
Deferred Finance Costs, Net, Total |  |  | 274 | 293
Long-term obligations including current maturities |  |  | $ 124,726 | $ 124,707
Interest rate on senior unsecured notes (as a percent) |  |  | 3.49% | 3.49%
Senior unsecured notes 3.4%, due in 2024 |  |  |  |
Debt |  |  |  |
Long-term obligations gross including current maturities |  |  | $ 50,000 | $ 50,000
Deferred Finance Costs, Net, Total |  |  | 111 | 118
Long-term obligations including current maturities |  |  | $ 49,889 | $ 49,882
Interest rate on senior unsecured notes (as a percent) |  |  | 3.40% | 3.40%
Senior unsecured notes 3.5%, due in 2024 |  |  |  |
Debt |  |  |  |
Term of debt | 9 years |  |  |
Long-term obligations gross including current maturities |  |  | $ 100,000 | $ 100,000
Deferred Finance Costs, Net, Total |  |  | 274 | 293
Long-term obligations including current maturities |  |  | $ 99,726 | $ 99,707
Interest rate on senior unsecured notes (as a percent) |  |  | 3.49% | 3.49%
Senior unsecured notes 3.6%, due in 2025 |  |  |  |
Debt |  |  |  |
Term of debt |  | 11 years |  |
Long-term obligations gross including current maturities |  |  | $ 125,000 | $ 125,000
Deferred Finance Costs, Net, Total |  |  | 284 | 298
Long-term obligations including current maturities |  |  | $ 124,716 | $ 124,702
Interest rate on senior unsecured notes (as a percent) |  |  | 3.61% | 3.61%
Senior unsecured notes 3.6%, due in 2026 |  |  |  |
Debt |  |  |  |
Term of debt | 11 years |  |  |
Long-term obligations gross including current maturities |  |  | $ 125,000 | $ 125,000
Deferred Finance Costs, Net, Total |  |  | 284 | 298
Long-term obligations including current maturities |  |  | $ 124,716 | $ 124,702
Interest rate on senior unsecured notes (as a percent) |  |  | 3.61% | 3.61%
Capital lease obligations |  |  |  |
Debt |  |  |  |
Long-term obligations gross including current maturities |  |  | $ 1,932 | $ 1,628
Long-term obligations including current maturities |  |  | $ 1,932 | $ 1,628

X
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