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FINANCING ARRANGEMENTS (Summary of Financing Arrangements) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |
Current portion of long-term obligations | $ 4,000 |  | $ 4,000 |  | $ 0
Long-term obligations | 1,640,000 |  | 1,640,000 |  | 1,645,000
Unamortized debt issuance costs and debt discount/premium, net | (14,029) |  | (14,029) |  | (11,728)
Long-term obligations, at carrying value | 1,625,971 |  | 1,625,971 |  | 1,633,272
Total current and long-term obligations, at carrying value | 1,629,971 |  | 1,629,971 |  | 1,633,272
Service revenues | 612,352 | $ 594,225 | 1,783,506 | $ 1,709,018 |
Secured debt | Term Loan Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Current portion of long-term obligations | 4,000 |  | 4,000 |  | 0
Long-term obligations | 395,000 |  | 395,000 |  | 0
Unsecured debt | Senior unsecured notes, at 5.25%, due August 1, 2020 (2020 Notes) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term obligations | $ 400,000 |  | $ 400,000 |  | 800,000
Interest rate | 5.25% |  | 5.25% |  |
Unsecured debt | Senior unsecured notes, at 5.125%, due June 1, 2021 (2021 Notes) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term obligations | $ 845,000 |  | $ 845,000 |  | $ 845,000
Interest rate | 5.125% |  | 5.125% |  |

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