Bond Exchange Early Participation Payment

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Debt Conversion, Original Debt, Interest Rate of Debt, Percent Payable In Cash

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Debt Conversion, Original Debt, Interest Rate of Debt, Percent Payable In Cash Or Additional Notes

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Debt Instrument, Convertible, Trading Period Conversion Price

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Debt Instrument, Fixed Charge Coverage Ratio

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Debt Instrument, Fixed Charge Coverage Ratio, Consecutive Days Threshold

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Debt Instrument, Issuance Price of Par, Percentage

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Increase (Decrease) in Deferred Loan Costs Written Off

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Line Of Credit Facility, Borrowing Base Percentage

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Line of Credit Facility, Current Borrowing Capacity Quarterly Reduction

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Percentage of Borrowing Base

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The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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The rate of interest that was being paid on the original debt issue that is being converted in the noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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

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Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

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

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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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Fair value amount of debt instrument that was repurchased.

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Face (par) amount of the original debt instrument that was repurchased.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Weighted average interest rate of debt outstanding.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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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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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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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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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Net amount of other deferred costs capitalized at the end of the reporting period. Does not include deferred finance costs or deferred acquisition costs of insurance companies.

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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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Debt - Narrative (Details)		3 Months Ended			6 Months Ended	9 Months Ended
Debt - Narrative (Details)	Aug. 04, 2020 USD ($) d $ / shares shares	Sep. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Nov. 30, 2013 USD ($)	Oct. 31, 2013 USD ($)
Debt Instrument [Line Items]
Gain on extinguishment of debt		$ 28,734,000		$ 0		$ 72,478,000	$ 0
Long-term debt, gross		291,314,000				291,314,000		$ 399,579,000
Unamortized debt premium (discount)		31,856,000				31,856,000		(770,000)
Long-term debt		290,019,000				290,019,000		398,862,000
Bond exchange early participant payment						3,500,000	0
Borrowings of debt						85,000,000	97,000,000
Deferred loan costs written off						2,262,000	$ 0
Outstanding letters of credit		31,900,000				31,900,000		24,500,000
Senior Notes
Debt Instrument [Line Items]
Face amount									$ 100,000,000.0	$ 300,000,000.0
Debt stated interest rate										6.25%
Issuance price of par percent									103.25%
Debt repurchased face amount					$ 71,900,000
Debt repurchase amount					27,700,000
Gain on extinguishment of debt					$ 43,800,000
Long-term debt, gross		12,655,000				12,655,000		400,000,000
Deferred costs capitalized		9,700,000				9,700,000
Deferred loan costs written off			$ 2,000,000.0
2025 Notes
Debt Instrument [Line Items]
Face amount	$ 315,500,000	150,000,000.0				150,000,000.0
Gain on extinguishment of debt	(28,700,000)
Long-term debt, gross	$ 282,600,000	315,489,000				315,489,000		0
Debt conversion, interest rate of debt	9.00%
Unamortized debt premium (discount)	$ (32,900,000)
Long-term debt	$ 314,800,000
Debt conversion, percent payable in cash	6.25%
Debt conversion, percent payable in cash or additional notes	2.75%
Debt conversion shares amount \| shares	740.7407
Debt conversion amount	$ 1,000
Conversion price (in usd per share) \| $ / shares	$ 1.35
Threshold trading days \| d	20
Trading period conversion price \| $ / shares	$ 1.50
Credit Facility
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity		$ 108,600,000				$ 108,600,000
Percentage of borrowing base		50.00%				50.00%
Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 250,000,000.0	$ 300,000,000.0				$ 300,000,000.0
Deferred loan costs written off		300,000
Credit Facility \| Foreign Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		45,000,000.0				45,000,000.0
Credit Facility \| Letter of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		25,000,000.0				25,000,000.0
Credit Facility \| Letter of Credit \| Canadian Subsidiaries
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 3,000,000.0				$ 3,000,000.0
2017 Credit Facility
Debt Instrument [Line Items]
Weighted average interest rate		2.40%				2.40%
Unused capacity commitment fee percentage						0.375%
2017 Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Commitment fee percentage						0.50%
2017 Credit Facility \| Credit Facility
Debt Instrument [Line Items]
Long-term debt, gross		$ 0				$ 0		$ 0
Line of credit facility, current borrowing capacity		140,500,000				140,500,000
Borrowings of debt						0
2017 Credit Facility \| Credit Facility \| Letter of Credit
Debt Instrument [Line Items]
Line of credit outstanding		31,900,000				$ 31,900,000
80% of Borrowing Base \| Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Borrowing base percentage						80.00%
Line of credit facility, current borrowing capacity		130,000,000.0				$ 130,000,000.0
Current borrowing capacity quarterly reduction		500,000				500,000
12.5% of Borrowing Base \| Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 31,250,000				$ 31,250,000
Percentage of borrowing base		12.50%				12.50%
Interest Rate Floor \| Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Variable interest spread						0.75%
London Interbank Offered Rate (LIBOR) \| Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Variable interest spread						2.50%
London Interbank Offered Rate (LIBOR) \| 2017 Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Variable interest spread						1.00%
Base Rate \| Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Variable interest spread						1.50%
Federal Funds Effective Swap Rate \| 2017 Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Variable interest spread						0.50%
CDOR Rate \| 2017 Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Variable interest spread						1.00%
Minimum \| Credit Facility
Debt Instrument [Line Items]
Fixed charge coverage ratio						1.00
Fixed charge coverage ratio consecutive days threshold						60 days