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Stock-Based Compensation Plans Stock Option & SARS activity (Tables)
 12 Months Ended
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights Award Activity [Table Text Block]
The following table summarizes stock options and stock appreciation rights activity:
 
2016
 
2015
 
2014
 
 
 
Weighted-
Average
Exercise
Price Per
Share
 
 
 
Weighted-
Average
Exercise
Price Per
Share
 
 
 
Weighted-
Average
Exercise
Price Per
Share
(in thousands, except per share amounts)
Shares
 
 
Shares
 
 
Shares
 
Outstanding at January 1,
776

 
$
19.27

 
1,045

 
$
19.27

 
1,225

 
$
18.31

Granted *
—

 
—

 
—

 
—

 
200

 
17.02

Exercised
(236
)
 
16.12

 
(7
)
 
9.15

 
(145
)
 
8.65

Forfeited
(11
)
 
16.16

 
(100
)
 
18.71

 
(43
)
 
19.95

Expired
(139
)
 
22.79

 
(162
)
 
20.05

 
(192
)
 
18.69

Outstanding at December 31,
390

 
$
20.00

 
776

 
$
19.27

 
1,045

 
$
19.27

Expected to vest at December 31,
390

 
$
20.00

 
776

 
$
19.27

 
1,045

 
$
19.27

Exercisable at December 31,
330

 
$
20.56

 
635

 
$
19.65

 
695

 
$
19.91

 
 
 
 
 
 
 
 
 
 
 
 
(dollars in millions)
 
 
 
 
 
 
 
 
 
 
 
Compensation expense for the year
$
0.4

 
 
 
$
—

 
 
 
$
0.3

 
 
Tax benefit related to compensation expense
$
(0.1
)
 
 
 
$
—

 
 
 
$
(0.1
)
 
 
Intrinsic value of awards exercised
$
1.8

 
 
 
$
0.1

 
 
 
$
1.5

 
 
Cash received from awards exercised
$
3.8

 
 
 
$
0.1

 
 
 
$
1.3

 
 
Grant date fair value of awards vested
$
0.5

 
 
 
$
0.7

 
 
 
$
0.4

 
 
 
 
 
 
 
 
 
 
 
 
 
 
* Assumes the maximum number of awards that can be earned if the performance conditions are achieved.
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
The following table summarizes our outstanding and exercisable awards at December 31, 2016:
 
Outstanding
 
Exercisable
 
 
 
Weighted-
Average
Exercise
Price Per
Share
 
 
 
Weighted-
Average
Exercise
Price Per
Share
(in thousands, except per share amounts)
Shares
 
 
Shares
 
$8.35
26

 
$
8.35

 
26

 
$
8.35

$12.40 to $17.05
174

 
17.01

 
114

 
17.03

$23.10 to $26.55
190

 
24.35

 
190

 
24.35

Total
390

 
$
20.00

 
330

 
$
20.56
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The fair values at the date of grant were estimated using the Black-Scholes pricing model with the following assumptions:
 
2016
2015
2014
Expected volatility
—

—

35.5
%
Risk-free interest rate
—

—

1.5
%
Expected holding period (in years)
—

—

5

Expected dividends
—

—

0.0
%
Weighted-average grant date fair value
$
—

$
—

$
5.71
Performance Based Awards [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Nonvested Share Activity [Table Text Block]
The following table summarizes our outstanding performance-based restricted award activity:
 
2016
 
2015
 
2014
 
 
 
Weighted-
Average
Exercise
Price Per
Share
 
 
 
Weighted-
Average
Exercise
Price Per
Share
 
 
 
Weighted-
Average
Exercise
Price Per
Share
(in thousands, except per share amounts)
Shares
 
 
Shares
 
 
Shares
 
Non-vested at January 1,
721

 
$
16.77

 
349

 
$
19.28

 
307

 
$
19.88

Granted*
307

 
15.45

 
538

 
15.46

 
217

 
17.80

Vested
(51
)
 
22.75

 
(89
)
 
19.00

 
(127
)
 
18.55

Forfeited
(23
)
 
22.35

 
(77
)
 
16.44

 
(48
)
 
18.33

Non-vested at December 31,
954

 
$
15.89

 
721

 
$
16.77

 
349

 
$
19.28

 
 
 
 
 
 
 
 
 
 
 
 
(dollars in millions)
 
 
 
 
 
 
 
 
 
 
 
Compensation expense for the year
$
3.6

 
 
 
$
3.1

 
 
 
$
1.4

 
 
Tax benefit related to compensation expense
$
(1.3
)
 
 
 
$
(1.1
)
 
 
 
$
(0.5
)
 
 
Grant date fair value of awards vested
$
1.2

 
 
 
$
1.7

 
 
 
$
2.3

 
 
 
 
 
 
 
 
 
 
 
 
 
 
* Assumes the maximum number of awards that can be earned if the performance conditions are achieved.
Restricted Stock [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Nonvested Share Activity [Table Text Block]
The following table summarizes our time-based restricted award activity: 
 
2016
 
2015
 
2014
 
 
 
Weighted-
Average
Exercise
Price Per
Share
 
 
 
Weighted-
Average
Exercise
Price Per
Share
 
 
 
Weighted-
Average
Exercise
Price Per
Share
(in thousands, except per share amounts)
Shares
 
 
Shares
 
 
Shares
 
Non-vested at January 1,
47

 
$
19.59

 
137

 
$
18.44

 
209

 
$
17.73

Granted
106

 
16.75

 
36

 
17.35

 
35

 
16.04

Vested
(47
)
 
19.59

 
(126
)
 
17.70

 
(103
)
 
16.22

Forfeited
—

 
—

 
—

 
—

 
(4
)
 
17.55

Non-vested at December 31,
106

 
$
16.75

 
47

 
$
19.59

 
137

 
$
18.44

 
 
 
 
 
 
 
 
 
 
 
 
(dollars in millions)
 
 
 
 
 
 
 
 
 
 
 
Compensation expense for the year
$
1.1

 
 
 
$
1.0

 
 
 
$
1.6

 
 
Tax benefit related to compensation expense
$
(0.4
)
 
 
 
$
(0.3
)
 
 
 
$
(0.6
)
 
 
Grant date fair value of awards vested
$
0.9

 
 
 
$
2.2

 
 
 
$
1.7