v3.8.0.1

Long-Term Debt - Schedule of Outstanding Senior Notes Issuances (Details) - USD ($) | Sep. 30, 2017 | Jun. 27, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Unamortized debt issuance costs | $ 8,070,000 |  | $ 11,091,000
Senior notes, net | 254,430,000 |  | 351,409,000
Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal | 262,500,000 |  | 362,500,000
Unamortized debt issuance costs | 8,070,000 |  | 11,091,000
Senior notes, net | 254,430,000 |  | 351,409,000
Senior Notes [Member] | 2016 Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal | 110,000,000 |  | 110,000,000
Unamortized debt issuance costs | 3,664,000 |  | 3,694,000
Senior notes, net | 106,336,000 |  | 106,306,000
Original debt issuance costs | $ 3,715,000 |  |
Coupon rate | 6.625% |  |
Effective interest rate | 7.07% |  |
Senior Notes [Member] | 2013 Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal | $ 152,500,000 |  | 152,500,000
Unamortized debt issuance costs | 4,406,000 |  | 4,532,000
Senior notes, net | 148,094,000 |  | 147,968,000
Original debt issuance costs | $ 5,054,000 |  |
Coupon rate | 7.75% |  |
Effective interest rate | 8.04% |  |
Senior Notes [Member] | 2012 Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal | $ 0 | $ 100,000,000 | 100,000,000
Unamortized debt issuance costs | 0 |  | 2,865,000
Senior notes, net | 0 |  | $ 97,135,000
Original debt issuance costs | $ 3,406,000 |  |
Coupon rate | 8.00% |  |
Effective interest rate | 8.31% |  |

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