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Stock Based Compensation Summary of Stock Based Compensation Plan Activity (Tables)
 12 Months Ended
Dec. 31, 2018
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Share-based Compensation, Stock Options, Activity [Table Text Block] A summary of PSP activity for the years ended December 31, 2018, 2017 and 2016 is as follows:
 
Weighted-
average
grant
date fair
value
 
Granted
shares
 
Awarded
shares
 
Shares not
yet
awarded
Outstanding at January 1, 2016
$
4.52

 
3,204,428

 
3,188,428

 
16,000

Granted
$
—

 
—

 
—

 
—

Awarded
$
—

 
—

 
8,000

 
(8,000
)
Vested
$
3.19

 
(1,012,844
)
 
(1,012,844
)
 
—

Forfeited
$
5.26

 
(185,034
)
 
(177,034
)
 
(8,000
)
Outstanding at December 31, 2016
$
5.11

 
2,006,550

 
2,006,550

 
—

Granted
$
—

 
—

 
—

 
—

Awarded
$
—

 
—

 
—

 
—

Vested
$
4.81

 
(277,602
)
 
(277,602
)
 
—

Forfeited
$
5.24

 
(34,472
)
 
(34,472
)
 
—

Outstanding at December 31, 2017
$
5.16

 
1,694,476

 
1,694,476

 
—

Granted
$
—

 
—

 
—

 
—

Awarded
$
—

 
—

 
—

 
—

Vested
$
5.53

 
(453,860
)
 
(453,860
)
 
—

Forfeited
$
4.92

 
(44,524
)
 
(44,524
)
 
—

Outstanding at December 31, 2018
$
5.03

 
1,196,092

 
1,196,092

 
—

A summary of SIP activity for the years ended December 31, 2018, 2017 and 2016 is as follows:
 
Weighted-
average
grant
date fair
value
 
Granted
shares
 
Awarded
shares
 
Shares not
yet
awarded
 
Outstanding at January 1, 2016
$
14.37

 
12,553,944

 
2,259,988

 
10,293,956

 
Granted
$
17.76

 
1,944,198

 
365,306

 
1,578,892

(1) 
Awarded
$
12.46

 
—

 
2,862,638

 
(2,862,638
)
 
Vested
$
13.66

 
(333,768
)
 
(333,768
)
 
—

 
Forfeited
$
12.67

 
(1,908,262
)
 
(351,576
)
 
(1,556,686
)
 
Outstanding at December 31, 2016
$
14.98

 
12,256,112

 
4,802,588

 
7,453,524

 
Granted
$
20.82

 
1,392,912

 
241,334

 
1,151,578

(2) 
Awarded
$
15.72

 
—

 
326,808

 
(326,808
)
 
Vested
$
12.61

 
(484,914
)
 
(484,914
)
 
—

 
Forfeited
$
14.89

 
(342,120
)
 
(76,212
)
 
(265,908
)
 
Outstanding at December 31, 2017
$
15.58

 
12,821,990

 
4,809,604

 
8,012,386

 
Granted
$
22.87

 
1,577,721

 
454,313

 
1,123,408

(3) 
Awarded
$
15.89

 
—

 
2,489,905

 
(2,489,905
)
 
Vested
$
14.09

 
(933,916
)
 
(933,916
)
 
—

 
Forfeited
$
16.37

 
(2,363,420
)
 
(224,587
)
 
(2,138,833
)
 
Outstanding at December 31, 2018
$
16.69

 
11,102,375

 
6,595,319

 
4,507,056