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Represents the consolidated total leverage ratio commencing on June 30, 2017.

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Represents the consolidated total leverage ratio commencing on March 31, 2018

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Percentage of maximum credit amount during any period after default or event of default.

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Represents the ratio of earnings before interest, depreciation and amortization divided by total debt service.

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Minimum percentage points of variable rate on the debt instrument.

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Represents information pertaining to revolving letter of credit trailing period.

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No definition available.

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Represents the number of consecutive days, a financial covenant requiring the Company to maintain a minimum consolidated fixed charge coverage ratio

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No definition available.

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Rate one at which loans or a loan portfolio are expected to prepay principal balance, used as an input to measure fair value.

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No definition available.

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Rate three at which loans or a loan portfolio are expected to prepay principal balance, used as an input to measure fair value.

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Rate two at which loans or a loan portfolio are expected to prepay principal balance, used as an input to measure fair value.

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No definition available.

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Letter of credit sublimit under the credit facility.

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Represents the minimum consolidated fixed charge coverage ratio.

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The percentage of eligible accounts receivable included as part of the calculation of the borrowing base.

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The maximum percentage of consolidated adjusted EBITDA permitted to be added back to consolidated adjusted EBITDA for leverage ratio purposes.

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No definition available.

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The percentage of parts supplies included as part of the calculation of the borrowing base.

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The percentage of unbilled accounts receivable included as part of the calculation of the borrowing base.

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The cash inflow from a term loan facility initially having maturity due after one year or beyond the operating cycle, if longer.

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No definition available.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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No definition available.

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The average effective interest rate during the reporting period.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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No definition available.

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Amount of increase (decrease) of the credit facility.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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LONG-TERM DEBT - ABL Facility (Details) - USD ($) $ in Millions				12 Months Ended
	Jun. 15, 2018	Aug. 31, 2017	Feb. 27, 2017	Dec. 31, 2019	Dec. 31, 2017
LONG-TERM DEBT
Proceeds from Term Loan Facility					$ 500.0
Outstanding letters of credit				$ 15.9
Senior Debt
LONG-TERM DEBT
Credit facility			$ 350.0
Equipment term loans \| Maximum
LONG-TERM DEBT
Interest rate (as a percent)				10.70%
Equipment term loans \| Minimum
LONG-TERM DEBT
Interest rate (as a percent)				1.50%
Term loan facility
LONG-TERM DEBT
Credit facility			$ 250.0
Term loan facility \| Credit Suisse AG
LONG-TERM DEBT
Percentage of EBITDA permitted to be added back (as a percent)				25.00%
Percentage of excess cash flow, mandatory prepayment, 2019				50.00%
Percentage of excess cash flow, mandatory prepayment, 2020				25.00%
Percentage of excess cash flow, mandatory prepayment, 2021				0.00%
Term loan facility \| Credit Suisse AG \| Commencing March 31 2018
LONG-TERM DEBT
Consolidated total leverage ratio commencing on March 31, 2018				4.00%
Term loan facility \| Credit Suisse AG \| Commencing March 31 2021
LONG-TERM DEBT
Consolidated total leverage ratio commencing on March 31, 2021				3.75%
Term loan facility \| Credit Suisse AG \| Base Rate
LONG-TERM DEBT
Floor rate (as a percent)			2.00%
Basis spread on variable rate			4.00%
Term loan facility \| Credit Suisse AG \| LIBOR
LONG-TERM DEBT
Floor rate (as a percent)			1.00%
Basis spread on variable rate			5.00%
Term loan facility \| Senior Debt \| Credit Suisse AG
LONG-TERM DEBT
Credit facility			$ 500.0
Average interest rate on term loan				7.40%
Revolving credit facility \| PNC Bank National Association \| Base Rate \| Less than 1.25 to 1.00
LONG-TERM DEBT
Fixed charge coverage ratio				2.25%
Revolving credit facility \| PNC Bank National Association \| Base Rate \| Greater than or equal to 1.25 to 1.00, but less than 1.50 to 1.00
LONG-TERM DEBT
Fixed charge coverage ratio				1.75%
Revolving credit facility \| PNC Bank National Association \| Base Rate \| Greater than or equal to 1.50 to 1.00, but less than 1.75
LONG-TERM DEBT
Fixed charge coverage ratio				1.25%
Revolving credit facility \| PNC Bank National Association \| Base Rate \| Greater than or equal to 1.75 to 1.00
LONG-TERM DEBT
Fixed charge coverage ratio				0.75%
Revolving credit facility \| PNC Bank National Association \| LIBOR \| Less than 1.25 to 1.00
LONG-TERM DEBT
Fixed charge coverage ratio				3.25%
Revolving credit facility \| PNC Bank National Association \| LIBOR \| Greater than or equal to 1.25 to 1.00, but less than 1.50 to 1.00
LONG-TERM DEBT
Fixed charge coverage ratio				2.75%
Revolving credit facility \| PNC Bank National Association \| LIBOR \| Greater than or equal to 1.50 to 1.00, but less than 1.75
LONG-TERM DEBT
Fixed charge coverage ratio				2.25%
Revolving credit facility \| PNC Bank National Association \| LIBOR \| Greater than or equal to 1.75 to 1.00
LONG-TERM DEBT
Fixed charge coverage ratio				1.75%
ABL Member
LONG-TERM DEBT
Credit facility			$ 70.0
Availability at closing				$ 86.8
Fixed charge coverage ratio Trailing Period				12 months
RLOC Utilization trailing period (in months)				12 months
Excess availability falling below amount		$ 15.0
Maximum credit amount (as a percent)		20.00%
Number of consecutive days, a financial covenant requiring the Company to maintain a minimum consolidated fixed charge coverage ratio		60 days
Minimum consolidated fixed charge coverage ratio		1.00%
ABL Member \| Credit Suisse AG
LONG-TERM DEBT
Consolidated total leverage ratio commencing on March 31, 2018				4.00%
Consolidated total leverage ratio commencing on March 31, 2021				3.75%
ABL Member \| PNC Bank National Association
LONG-TERM DEBT
Credit facility	$ 100.0
Term loan amortization period			5 years
Percentage of accounts receivable used as part of the borrowing base calculation			85.00%
Percentage of unbilled accounts receivable used as part of the borrowing base calculation			80.00%
Percentage of parts supplies used as part of the borrowing base calculation			50.00%
Facility's maximum credit amount	$ 30.0
Line of credit sublimit			$ 20.0
Outstanding letters of credit				$ 1.7
Interest rate (as a percent)				5.25%
ABL Member \| PNC Bank National Association \| Base Rate \| Less than 33.3%
LONG-TERM DEBT
Basis spread on variable rate				0.50%
ABL Member \| PNC Bank National Association \| Base Rate \| Greater than or equal to 33.3%, but less than 66.6%
LONG-TERM DEBT
Basis spread on variable rate				0.75%
ABL Member \| PNC Bank National Association \| Base Rate \| Greater than or equal to 66.6%
LONG-TERM DEBT
Basis spread on variable rate				1.00%
ABL Member \| PNC Bank National Association \| LIBOR \| Less than 33.3%
LONG-TERM DEBT
Basis spread on variable rate				1.50%
ABL Member \| PNC Bank National Association \| LIBOR \| Greater than or equal to 33.3%, but less than 66.6%
LONG-TERM DEBT
Basis spread on variable rate				1.75%
ABL Member \| PNC Bank National Association \| LIBOR \| Greater than or equal to 66.6%
LONG-TERM DEBT
Basis spread on variable rate				2.00%
ABL Member \| Letter of credit
LONG-TERM DEBT
Outstanding letters of credit				$ 13.9
Delayed Draw Feature
LONG-TERM DEBT
Credit facility			$ 100.0