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Stock Based Compensation Stock Options Outstanding (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] A summary of stock option activity for the years ended December 31, 2017, 2016 and 2015 is as follows:
Stock Options
 
Shares
Under
Option
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Term
(in years)
 
Aggregate
Intrinsic
Value
(in thousands)
Outstanding at January 1, 2015
 
470,356

 
$
18.57

 
3.1
 
$
5,087

Granted
 
—

 
$
—

 
 
 
 

Exercised
 
(151,767
)
 
$
18.48

 
 
 
 

Forfeited
 
(49,000
)
 
$
19.36

 
 
 
 

Expired
 
—

 
$
—

 
 
 
 

Outstanding at December 31, 2015
 
269,589

 
$
18.48

 
2.2
 
$
2,395

Granted
 
—

 
$
—

 
 
 
 

Exercised
 
(64,589
)
 
$
18.48

 
 
 
 

Forfeited
 
(30,000
)
 
$
18.48

 
 
 
 

Expired
 
—

 
$
—

 
 
 
 

Outstanding at December 31, 2016
 
175,000

 
$
18.48

 
1.2
 
$
4,616

Granted
 
—

 
$
—

 
 
 
 

Exercised
 
(175,000
)
 
$
18.48

 
 
 
 

Forfeited
 
—

 
$
—

 
 
 
 

Expired
 
—

 
$
—

 
 
 
 

Outstanding at December 31, 2017
 
—

 
$
—

 
N/A
 
$
—

Ending vested and expected to vest at December 31,
2017
 
—

 
$
—

 
N/A
 
$
—

Exercisable at December 31, 2017
 
—

 
$
—

 
N/A
 
$
—

Exercisable at December 31, 2016
 
175,000

 
$
18.48

 
1.2
 
$
4,616

Exercisable at December 31, 2015
 
164,589

 
$
18.48

 
2.2
 
$
2,241

A summary of SIP activity for the years ended December 31, 2017, 2016 and 2015 is as follows:
 
Weighted-
Average
Grant
Date Fair
Value
 
Granted
Shares
 
Awarded
Shares
 
Shares Not
Yet
Awarded
 
Outstanding at January 1, 2015
$
28.19

 
6,659,047

 
1,060,890

 
5,598,157

 
Granted
$
31.74

 
481,166

 
164,646

 
316,520

 
Awarded
$
—

 
—

 
—

 
—

 
Vested
$
—

 
—

 
—

 
—

 
Forfeited
$
26.32

 
(863,241
)
 
(95,542
)
 
(767,699
)
 
Outstanding at December 31, 2015
$
28.74

 
6,276,972

 
1,129,994

 
5,146,978

 
Granted
$
35.52

 
972,099

 
182,653

 
789,446

(1) 
Awarded
$
24.93

 
—

 
1,431,319

 
(1,431,319
)
 
Vested
$
27.31

 
(166,884
)
 
(166,884
)
 
—

 
Forfeited
$
25.34

 
(954,131
)
 
(175,788
)
 
(778,343
)
 
Outstanding at December 31, 2016
$
29.96

 
6,128,056

 
2,401,294

 
3,726,762

 
Granted
$
41.65

 
696,456

 
120,667

 
575,789

(2) 
Awarded
$
31.44

 
—

 
163,404

 
(163,404
)
 
Vested
$
25.22

 
(242,457
)
 
(242,457
)
 
—

 
Forfeited
$
29.77

 
(171,060
)
 
(38,106
)
 
(132,954
)
 
Outstanding at December 31, 2017
$
31.16

 
6,410,995

 
2,404,802

 
4,006,193

 
A summary of PSP activity for the years ended December 31, 2017, 2016 and 2015 is as follows:
 
Weighted-
Average
Grant
Date Fair
Value
 
Granted
Shares
 
Awarded
Shares
 
Shares Not
Yet
Awarded
Outstanding at January 1, 2015
$
8.71

 
1,928,631

 
1,903,213

 
25,418

Granted
$
—

 
—

 
—

 
—

Awarded
$
—

 
—

 
—

 
—

Vested
$
5.55

 
(208,889
)
 
(208,889
)
 
—

Forfeited
$
9.78

 
(117,528
)
 
(100,110
)
 
(17,418
)
Outstanding at December 31, 2015
$
9.03

 
1,602,214

 
1,594,214

 
8,000

Granted
$
—

 
—

 
—

 
—

Awarded
$
—

 
—

 
4,000

 
(4,000
)
Vested
$
6.39

 
(506,422
)
 
(506,422
)
 
—

Forfeited
$
10.52

 
(92,517
)
 
(88,517
)
 
(4,000
)
Outstanding at December 31, 2016
$
10.23

 
1,003,275

 
1,003,275

 
—

Granted
$
—

 
—

 
—

 
—

Awarded
$
—

 
—

 
—

 
—

Vested
$
9.61

 
(138,801
)
 
(138,801
)
 
—

Forfeited
$
10.47

 
(17,236
)
 
(17,236
)
 
—

Outstanding at December 31, 2017
$
10.32

 
847,238

 
847,238

 
—