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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