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Debt (Details Textual) - USD ($) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | May 31, 2017 | Mar. 31, 2018 | Dec. 31, 2017
Senior Notes due 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Net unamortized debt issuance costs |  |  | $ 4,700,000 | $ 4,900,000
Debt Instrument, Face Amount |  | $ 250,000,000 |  |
Proceeds from Debt |  | $ 245,000,000 |  |
Stated interest rate |  | 5.875% |  |
Silvertip Debt Obligation [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  | 15,000,000
Repayments of Debt |  |  | 12,600,000 |
Letter of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Letters of Credit Outstanding, Amount |  |  | 12,000,000 |
Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Net unamortized debt issuance costs |  |  | $ 1,800,000 | 1,900,000
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 |  |  |  | 73,000,000
Stated interest rate |  |  | 4.10% |
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] | 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% |  |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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. + References No definition available. + Details
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