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Stock Compensation (Summary of Restricted Stock) (Details 6) - Restricted Stock [Member]
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Nonvested Restricted Stock Outstanding [Line Items]  
Nonvested at December 31, 2015 | shares 5,589,687
Weighted average grant-date fair value, December 31, 2015 | $ / shares $ 9.27
Granted | shares 7,569,553
Weighted average grant-date fair value, granted | $ / shares $ 3.23
Vested | shares (2,906,465)
Weighted average grant-date fair value, vested | $ / shares $ 10.44
Forfeited | shares (511,990)
Weighted average grant-date fair value, forfeited | $ / shares $ 7.09
Nonvested at December 31, 2016 | shares 9,740,785
Weighted average grant-date fair value, December 31, 2016 | $ / shares $ 4.34