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LONG TERM DEBT AND CAPITAL LEASES - Credit Facility (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Line of Credit Facility [Line Items] |  |
Debt redemption price |  | 101.938%
Revolving Credit Facility due October 2021; bearing interest at LIBOR plus 3.00% |  |
Line of Credit Facility [Line Items] |  |
Basis spread on variable rate |  | 3.00%
Secured Debt | Term Loan B Facility |  |
Line of Credit Facility [Line Items] |  |
Principal amount |  | $ 350,000,000
Facility term |  | 7 years
Net leverage ratio |  | 3.75
Interest rate | 2.50% |
Secured Debt | Term Loan B Facility | LIBOR |  |
Line of Credit Facility [Line Items] |  |
Basis spread on variable rate |  | 2.75%
Secured Debt | Term Loan B Facility | LIBOR | Maximum |  |
Line of Credit Facility [Line Items] |  |
Basis spread on variable rate |  | 3.00%
Secured Debt | Term Loan B Facility | LIBOR Floor | Minimum |  |
Line of Credit Facility [Line Items] |  |
Basis spread on variable rate |  | 1.00%
Secured Debt | Term Loan Facility B, Repricing Amendment |  |
Line of Credit Facility [Line Items] |  |
Net leverage ratio | 3.75 |
Secured Debt | Term Loan Facility B, Repricing Amendment | LIBOR |  |
Line of Credit Facility [Line Items] |  |
Interest rate | 2.75% |
Secured Debt | Term Loan Facility B, Repricing Amendment | LIBOR | Debt Instrument, Covenant Compliance, Consolidated Net Leverage Ratio |  |
Line of Credit Facility [Line Items] |  |
Interest rate | 2.50% |
Secured Debt | Term Loan Facility B, Repricing Amendment | LIBOR Floor |  |
Line of Credit Facility [Line Items] |  |
Interest rate | 1.00% |
Secured Debt | Term Loan Facility B, Repricing Amendment | LIBOR Floor | Debt Instrument, Covenant Compliance, Consolidated Net Leverage Ratio |  |
Line of Credit Facility [Line Items] |  |
Interest rate | 1.00% |
Secured Debt | Term Loan Facility B, Repricing Amendment | Base Rate |  |
Line of Credit Facility [Line Items] |  |
Decrease in basis points | 0.25% |
Interest rate | 1.75% |
Secured Debt | Term Loan Facility B, Repricing Amendment | Base Rate | Debt Instrument, Covenant Compliance, Consolidated Net Leverage Ratio |  |
Line of Credit Facility [Line Items] |  |
Interest rate | 1.50% |
Line of Credit | Revolving Credit Facility due October 2021; bearing interest at LIBOR plus 3.00% | Revolving Credit Facility |  |
Line of Credit Facility [Line Items] |  |
Credit facility maximum |  | $ 160,000,000
Facility term |  | 5 years
Remaining capacity | $ 101,457,000 |
Line of Credit | Revolving Credit Facility due October 2021; bearing interest at LIBOR plus 3.00% | Revolving Credit Facility | Minimum |  |
Line of Credit Facility [Line Items] |  |
Debt instrument interest rate |  | 2.50%
Line of Credit | Revolving Credit Facility due October 2021; bearing interest at LIBOR plus 3.00% | Revolving Credit Facility | Maximum |  |
Line of Credit Facility [Line Items] |  |
Debt instrument interest rate |  | 3.25%
Line of Credit | Revolving Credit Facility due October 2021; bearing interest at LIBOR plus 3.00% | Letter of Credit |  |
Line of Credit Facility [Line Items] |  |
Outstanding irrevocable letters of credit totaling | $ 22,543,000 |
Senior Subordinated Notes, Due February 2019; bore interest at 7.75% |  |
Line of Credit Facility [Line Items] |  |
Debt instrument interest rate |  | 7.75%
Revolving Credit Facility |  |
Line of Credit Facility [Line Items] |  |
Additional revolver capacity |  | $ 100,000,000
Interest rate | 2.75% |

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