Stock-based Compensation - Performance Unit Awards - Assumptions (Details) - Performance Unit Awards |
12 Months Ended |
|---|---|
|
Dec. 31, 2016
$ / shares
| |
| Stock-based Compensation | |
| Forecast period (years) | 2 years 7 months 6 days |
| Risk-free interest rate (as a percent) | 1.00% |
| Jones stock price volatility (as a percent) | 71.47% |
| Expected payout per unit as of the grant date (in dollars per share) | $ 67.38 |