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Stock Based Compensation (Tables)
12 Months Ended
Dec. 31, 2016
Share-based Compensation [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
A summary of the status of stock options granted is presented below:
 
 
 
 
 
 
Weighted
 
 
 
 
 
 
 
 
Average
 
 
 
 
 
 
Weighted
 
Remaining
 
Aggregate
 
 
 
 
Average
 
Contractual
 
Intrinsic
 
 
 
 
Exercise
 
Term (in
 
Value (in
 
 
Shares
 
Price
 
years)
 
thousands)
Balance at December 31, 2015
 
3,621,002

 
$43.15
 
 
 
 
Granted
 
3,369,197

 
$4.22
 
 
 
 
Exercised
 

 
 
 
 
 
Forfeited
 
(781,386
)
 
$36.32
 
 
 
 
Balance at December 31, 2016
 
6,208,813

 
$22.88
 
6.02

 
$

Vested
 
2,990,263

 
$43.12
 
2.57

 
$

Exercisable at December 31, 2016
 
2,990,263

 
$43.12
 
2.57

 
$

Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
 
 
Number of
 
Weighted Average
 
 
Shares
 
Grant Date Fair Value
Nonvested at December 31, 2015
 
1,303,573

 
$32.60
Granted
 
27,379

 
$17.99
Vested
 
(579,246
)
 
$32.97
Forfeited
 
(88,703
)
 
$30.42
Nonvested at December 31, 2016
 
663,003

 
$31.97
Schedule of Nonvested Performance-based Units Activity [Table Text Block]
he following table represents the nonvested performance share units and their corresponding fair value (based upon the closing share price) on the date of grant:
 
 
Number of
 
Weighted Average
 
 
Shares
 
Grant Date Fair Value
Nonvested at December 31, 2015
 
491,493

 
$27.83
Granted
 
950,404

 
$25.55
Vested
 

 
Forfeited
 
(17,346
)
 
$19.62
Nonvested at December 31, 2016
 
1,424,551

 
$26.41