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Employee Compensation and Benefit Plans Schedule of Stock Unit Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Unvested at beginning of year (in shares) 835,730 [1],[2] 79,612 [1],[2] 28,235
Unvested at beginning of year (in dollar per share) $ 10.00 [1],[2] $ 32.23 [1],[2] $ 25.23
Granted (in shares) [3],[4] 2,184,100 790,397 63,500
Granted (in dollar per share) [3],[4] $ 2.19 $ 8.53 $ 34.34
Vested (in shares) [5],[6] (26,666) (34,279) (12,123)
Vested (in dollar per share) [5],[6] $ 32.56 $ 27.92 $ 26.98
Forfeited/Canceled (in shares) (241,110) 0 0
Forfeited/Canceled (in dollar per share) $ 6.17 $ 0.00 $ 0.00
Unvested at end of year (in shares) [1],[2] 2,752,054 835,730 79,612
Unvested at end of year (in dollar per share) [1],[2] $ 3.91 $ 10.00 $ 32.23
[1] At December 31, 2016, the weighted average remaining contractual term of share units outstanding was 2.60 years.
[2] Excluding the 502,446 market-based stock awards that have not met their performance criteria, the net aggregate intrinsic value of stock awards outstanding at December 31, 2016 was $12.1 million.
[3] Stock units granted in 2015 included 584,438 stock units with a market condition for vesting based on an average common stock trading price of $16.26. As of December 31, 2016, these awards had not yet met the market condition.
[4] Stock units granted in 2016 included 1,156,500 stock units with a market condition for vesting based on an average common stock trading price of $4.78. The market condition for these awards was met on November 30, 2016.
[5] The total fair value of the stock units that vested during 2016, 2015 and 2014, based on grant-date fair value, was $0.9 million, $1.0 million and $0.3 million, respectively.
[6] The total intrinsic value of stock units vested, which is defined as the market value of the stock on the date of vesting, was $0.1 million, $0.3 million and $0.3 million for 2016, 2015 and 2014, respectively.