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Long-term Debt - Issuance of the 8.00% 2019 and 8.30% 2022 Notes (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Nov. 06, 2014
8.00% 2019 Notes |  |
Long-term debt [Line Items] |  |
Interest rate |  | 8.00%
Proceeds from issuance of notes | $ 48,425 |
Maturity date | Nov. 30, 2019 |
Frequency of payments | quarterly in arrears on each February 15, May 15, August 15 and November 15 |
Issuance date | Nov. 06, 2014 |
Date of first required payment | Feb. 15, 2015 |
Face amount | $ 50,000 |
Redemption description | On December 11, 2017, the Company used the proceeds of the 8.30% 2022 Notes (described below) to redeem all of the 2019 Notes at a redemption price equal to 100% of the principal amount to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date. |
Redemption price percentage | 100.00% |
8.30% 2022 Notes |  |
Long-term debt [Line Items] |  |
Interest rate | 8.30% |
Maturity date | Nov. 15, 2022 |
Frequency of payments | quarterly in arrears on the 15th day of February, May, August and November |
Issuance date | Nov. 09, 2017 |
Date of first required payment | Feb. 15, 2018 |
Face amount | $ 50,000 |
Period One, From issuance until May 15, 2019 | 8.30% 2022 Notes |  |
Long-term debt [Line Items] |  |
Redemption description | Prior to May 15, 2019, the Company may redeem the 2022 Notes, in whole or in part, at a price equal to 100% of the principal amount plus a make-whole premium and accrued interest to the date of redemption. |
Redemption price percentage | 100.00% |
Period Two, On or after May 15, 2019 until maturity | 8.30% 2022 Notes |  |
Long-term debt [Line Items] |  |
Redemption description | The Company may redeem the 2022 Notes at its option, in whole or in part, at any time after May 15, 2019, at a redemption price equal to 100% of the principal amount of the 2022 Notes to be redeemed plus accrued and unpaid interest |
Redemption price percentage | 100.00% |
Certain changes in taxation | 8.30% 2022 Notes |  |
Long-term debt [Line Items] |  |
Redemption description | In addition, the Company may redeem the 2022 Notes in whole, but not in part, at any time at its option, at a redemption price equal to 100% of the principal amount to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date, if certain events occur involving changes in taxation. |
Redemption price percentage | 100.00% |

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