XML 133 R101.htm IDEA: XBRL DOCUMENT
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Debt (Details Textual) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
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% |  |  |  |  |

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