Income Taxes (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Income Tax Contingency [Line Items] | ||||||
| Income tax expense (benefit) | $ 8,527 | $ (22,075) | $ (3,801) | $ (27,784) | ||
| Tax provision adjustment | $ 800 | $ 400 | ||||
| Term of cumulative pretax net losses | 3 years | |||||
| Term of improvement in book income | 5 years | |||||
| FTC contempt action | Settled litigation | ||||||
| Income Tax Contingency [Line Items] | ||||||
| Settlement amount | $ 116,000 | |||||
| Legal reserve | ||||||
| Income Tax Contingency [Line Items] | ||||||
| Reserves | $ 96,000 | $ 20,000 | ||||