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Stock Based Compensation (Tables) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation $ 15,513 $ 19,363 $ 22,603
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
A summary of PSP activity for the years ended December 31, 2015, 2014 and 2013 is as follows:
 
Weighted-
Average
Grant
Date Fair
Value
 
Granted
Shares
 
Awarded
Shares
 
Shares Not
Yet
Awarded
Outstanding at January 1, 2013
$
8.72

 
3,691,022

 
2,394,505

 
1,296,517

Granted
$
—

 
—

 
—

 
—

Awarded
$
10.25

 
—

 
122,021

 
(122,021
)
Vested
$
4.01

 
(119,364
)
 
(119,364
)
 
—

Forfeited
$
8.73

 
(1,200,371
)
 
(101,310
)
 
(1,099,061
)
Outstanding at December 31, 2013
$
8.62

 
2,371,287

 
2,295,852

 
75,435

Granted
$
—

 
—

 
—

 
—

Awarded
$
—

 
—

 
—

 
—

Vested
$
16.76

 
(277,009
)
 
(277,009
)
 
—

Forfeited
$
9.75

 
(165,647
)
 
(115,630
)
 
(50,017
)
Outstanding at December 31, 2014
$
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

A summary of stock option activity for the years ended December 31, 2015, 2014 and 2013 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, 2013
 
738,792

 
$
18.39

 
4.9
 
$
8,891

Granted
 
—

 
$
—

 
 
 
 

Exercised
 
(115,847
)
 
$
17.56

 
 
 
 

Forfeited
 
—

 
$
—

 
 
 
 

Expired
 
—

 
$
—

 
 
 
 

Outstanding at December 31, 2013
 
622,945

 
$
18.55

 
4.1
 
$
7,289

Granted
 
—

 
$
—

 
 
 
 

Exercised
 
(106,589
)
 
$
18.48

 
 
 
 

Forfeited
 
(46,000
)
 
$
18.48

 
 
 
 

Expired
 
—

 
$
—

 
 
 
 

Outstanding at December 31, 2014
 
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

Ending vested and expected to vest at December 31,
2015
 
269,589

 
$
18.48

 
2.2
 
$
2,395

Exercisable at December 31, 2015
 
164,589

 
$
18.48

 
2.2
 
$
2,241

Exercisable at December 31, 2014
 
316,356

 
$
18.48

 
3.2
 
$
4,565

Exercisable at December 31, 2013
 
422,945

 
$
18.48

 
4.2
 
$
5,460

A summary of SIP activity for the years ended December 31, 2015, 2014 and 2013 is as follows:
 
Weighted-
Average
Grant
Date Fair
Value
 
Granted
Shares
 
Awarded
Shares
 
Shares Not
Yet
Awarded
Outstanding at January 1, 2013
$
22.91

 
3,157,311

 
37,408

 
3,119,903

Granted
$
31.95

 
3,719,974

 
—

 
3,719,974

Awarded
$
30.71

 
—

 
966,215

 
(966,215
)
Vested
$
—

 
—

 
—

 
—

Forfeited
$
23.88

 
(271,184
)
 
(7,906
)
 
(263,278
)
Outstanding at December 31, 2013
$
27.96

 
6,606,101

 
995,717

 
5,610,384

Granted
$
31.02

 
422,572

 
113,088

 
309,484

Awarded
$
—

 
—

 
—

 
—

Vested
$
—

 
—

 
—

 
—

Forfeited
$
27.41

 
(369,626
)
 
(47,915
)
 
(321,711
)
Outstanding at December 31, 2014
$
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

    
Stock Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation $ 11,111 14,447 15,934
PerformanceStock​Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation 972 2,354 2,310
Employee Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation $ 3,430 $ 2,425 $ 3,538