Redemption price per $1,000 of principal.

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Line of Credit Facility, Additional Borrowing Capacity

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- Definition

Contractual interest rate for funds borrowed, under the Silvertip Debt Obligation.

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No definition available.

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Contractual interest rate for funds borrowed, under the Silvertip Debt Obligation.

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No definition available.

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- Definition

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

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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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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Percentage of principal amount of debt redeemed.

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No definition available.

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- Definition

Fair value amount of debt instrument that was repurchased.

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No definition available.

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- Definition

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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- Definition

Amount, after accumulated amortization, of debt discount (premium).

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- Definition

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

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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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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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- Definition

The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

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No definition available.

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Debt (Details Textual) - USD ($)	1 Months Ended		12 Months Ended
Debt (Details Textual) - USD ($)	Sep. 30, 2017	May 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jun. 30, 2017
Debt Instrument [Line Items]
Gain (Loss) on Extinguishment of Debt			$ 9,342,000	$ 21,365,000	$ (15,916,000)
Senior Notes due 2021
Debt Instrument [Line Items]
Stated interest rate	7.875%
Silvertip Debt Obligation [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			5,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Net unamortized debt issuance costs			1,900,000
Senior Notes due 2024
Debt Instrument [Line Items]
Net unamortized debt issuance costs			4,900,000
Debt Instrument, Face Amount		$ 250,000,000
Proceeds from Debt		$ 245,000,000
Stated interest rate		5.875%
Debt Instrument, Redemption Price, Percentage		100.00%
Senior Notes due 2021
Debt Instrument [Line Items]
Net unamortized debt issuance costs				$ 2,000,000
Debt Instrument, Repurchase Amount		$ 178,000,000
Gain (Loss) on Extinguishment of Debt			9,300,000
Debt Instrument, Redemption, Equity Offering [Member] \| Senior Notes due 2024
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed		35.00%
Debt Instrument, Redemption Price, Percentage		105.875%
Debt Instrument, Tender [Member] \| Senior Notes due 2021
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount		$ 118,100,000
Debt Instrument, Redemption Price, Per $1,000 Principal		$ 1,043.88
Debt Instrument, Redeemed [Member] \| Senior Notes due 2021
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount						$ 59,900,000
Debt Instrument, Redemption Price, Per $1,000 Principal						$ 1,039.38
Letter of Credit [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount			12,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 200,000,000.0
Line of Credit Facility, Additional Borrowing Capacity	$ 50,000,000.0
Debt Instrument, Term	4 years
Line of Credit Facility, Current Borrowing Capacity			$ 88,000,000
Stated interest rate			3.70%
Silvertip [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount			$ 100,000,000
Base Rate [Member] \| Minimum \| Revolving Credit Facility
Debt Instrument [Line Items]
Stated interest rate	1.00%
Base Rate [Member] \| Maximum \| Revolving Credit Facility
Debt Instrument [Line Items]
Stated interest rate	1.75%
London Interbank Offered Rate (LIBOR) [Member] \| Silvertip Debt Obligation [Member]
Debt Instrument [Line Items]
Silvertip Debt Obligation, Interest Rate, Two of Three Tranches			5.50%
Silvertip Debt Obligation, Interest Rate, One of Three Tranches			6.675%
London Interbank Offered Rate (LIBOR) [Member] \| Minimum \| Revolving Credit Facility
Debt Instrument [Line Items]
Stated interest rate	2.00%
London Interbank Offered Rate (LIBOR) [Member] \| Maximum \| Revolving Credit Facility
Debt Instrument [Line Items]
Stated interest rate	2.75%