Long-Term Debt - Senior Notes Issuances (Details) - Senior Notes - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Debt Instrument [Line Items] | |||
| Debt Issuance Costs | $ 376,000 | $ 375,000 | $ 223,000 |
| 2011 Senior Notes | |||
| Debt Instrument [Line Items] | |||
| Principal | 107,500,000 | ||
| Debt Issuance Costs | 2,811,000 | ||
| Net Proceeds | $ 104,689,000 | ||
| Coupon rate | 8.25% | ||
| Effective interest rate | 8.47% | ||
| 2012 Senior Notes | |||
| Debt Instrument [Line Items] | |||
| Principal | $ 100,000,000 | ||
| Debt Issuance Costs | 3,406,000 | ||
| Net Proceeds | $ 96,594,000 | ||
| Coupon rate | 8.00% | ||
| Effective interest rate | 8.28% | ||
| 2013 Senior Notes | |||
| Debt Instrument [Line Items] | |||
| Principal | $ 152,500,000 | ||
| Debt Issuance Costs | 5,054,000 | ||
| Net Proceeds | $ 147,446,000 | ||
| Coupon rate | 7.75% | ||
| Effective interest rate | 8.04% | ||