The period in which a contingent consideration was earned in regards to performance targets being met.

No definition available.

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This is the per principle amount of debt used to calculated the conversion price and conversion ratios for convertible debt.

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Debt Instrument, Fix Rate Basis, Number Of 30-Day Months Of A Notional Interest Rate Swap

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Debt Instrument, Number of Loans

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Debt Instrument, Payment Start Date, Number Of Months Following Borrowing Date

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Debt Instrument, Periodic Payment Terms, Balloon Payments To Be Paid, Percentage of Face Amount

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- Definition

Number Of Tranches

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The net cash outflow resulting from payment of earn-out from a contingent consideration arrangement.

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No definition available.

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- Definition

The percentage difference of the strike price on the warrants compared to a specific date.

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Number of specified business days to determine variables in regards to loan interest rates.

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- Definition

Exercise price per share or per unit of warrants or rights outstanding.

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-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
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- Definition

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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- Definition

The price per share of the conversion feature embedded in the debt instrument.

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-SubTopic 20
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- Definition

Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
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- Definition

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

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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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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.

+ References

No definition available.

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- Definition

The premium (cost) of a hedge, net of any cash received on settlement during the period.

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No definition available.

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- Definition

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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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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The cash outflow for a financial contract that meets the hedge criteria as either cash flow hedge, fair value hedge or hedge of net investment in foreign operations.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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No definition available.

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The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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No definition available.

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DEBT - Narrative (Details)			1 Months Ended		9 Months Ended
DEBT - Narrative (Details)	Dec. 18, 2017 USD ($)	Jul. 17, 2017 USD ($) Days tranche Months Loan	Sep. 30, 2017 USD ($)	Apr. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) $ / shares	Dec. 31, 2016 USD ($)	Dec. 13, 2017
Debt Instrument [Line Items]
Proceeds from borrowings					$ 548,768,000	$ 360,240,000
Cost of Hedge Net of Cash Received	$ 10,100,000
Purchase of 4½% Convertible Senior Notes call option					40,393,000	0
Proceeds from Issuance of Warrants					$ 30,259,000	0
Class of Warrant or Right, Exercise Price of Warrants or Rights \| $ / shares					$ 20.02
Strike Price, Percentage Difference from Specific Date							60.00%
Payment of contingent consideration					$ 0	$ 10,000,000
Convertible Debt \| 4½% Convertible Senior Notes due 2023
Debt Instrument [Line Items]
Face amount of debt					$ 143,750,000
Stated interest rate					4.50%
Debt Instrument, Convertible, Conversion Price \| $ / shares					$ 15.64
Debt Instrument, Convertible, Conversion Ratio					63.9488
Debt Instrument, Convertible, Conversion Per Principal Amount					$ 1,000
Revolving Credit Facility
Debt Instrument [Line Items]
Proceeds from borrowings					174,800,000
Repayment of debt			$ 103,000,000		313,900,000
Maximum borrowing capacity					400,000,000
Letters of credit outstanding, amount					12,400,000
Term Loan
Debt Instrument [Line Items]
Face amount of debt					350,000,000
Repayment of debt	$ 89,600,000		93,700,000		209,500,000
Secured Debt \| PK Air Debt
Debt Instrument [Line Items]
Face amount of debt		$ 230,000,000
Number of term loans \| Loan		24
Number of tranches \| tranche		2
Payment starts date - number of months following borrowing date		7 months
Final payment amount as a percentage of face amount		53.00%
Terms of debt instruments		70 months
Secured Debt \| One-Month LIBOR \| PK Air Debt
Debt Instrument [Line Items]
Basis spread on variable rate		5.00%
Variable In Determining Interest Rate, Number of Days \| Days		2
Fix rate option, number of 30-day months on a notional interest rate swap \| Months		12
Term Loan Credit Facility
Debt Instrument [Line Items]
Face amount of debt					200,000,000
Repayment of debt			$ 17,000,000		$ 45,900,000
Other Debt \| Other Debt
Debt Instrument [Line Items]
Contingent consideration, period, payment				3 years
Payment of contingent consideration				$ 16,000,000