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Employee Compensation and Benefit Plans Schedule of Stock Unit Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Unvested at beginning of year (in shares) 2,752,054 [1],[2] 835,730 [1],[2] 79,612
Unvested at beginning of year (in dollar per share) $ 3.91 [1],[2] $ 10.00 [1],[2] $ 32.23
Granted (in shares) 971,761 2,184,100 790,397
Granted (in dollar per share) $ 2.56 $ 2.19 $ 8.53
Vested (in shares) [3],[4] (896,272) (26,666) (34,279)
Vested (in dollar per share) [3],[4] $ 3.26 $ 32.56 $ 27.92
Forfeited/Canceled (in shares) (73,625) (241,110) 0
Forfeited/Canceled (in dollar per share) $ 2.20 $ 6.17 $ 0.00
Unvested at end of year (in shares) [1],[2] 2,753,918 2,752,054 835,730
Unvested at end of year (in dollar per share) [1],[2] $ 3.69 $ 3.91 $ 10.00
[1] At December 31, 2017, the weighted average remaining contractual term of share units outstanding was 1.40 years.
[2] Excluding the 582,446 market-based stock awards that have not met their performance criteria, the net aggregate intrinsic value of stock awards outstanding at December 31, 2017 was $6.8 million. At December 31, 2017, 502,446 and 80,000 stock units with a market condition for vesting based on an average common stock trading price of $16.26 and $11.72, respectively, had not yet met the market condition.
[3] The total fair value of the stock units that vested during 2017, 2016 and 2015, based on grant-date fair value, was $2.9 million, $0.9 million and $1.0 million, respectively.
[4] The total intrinsic value of stock units vested, which is defined as the market value of the stock on the date of vesting, was $4.6 million, $0.1 million and $0.3 million for 2017, 2016 and 2015, respectively.