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Stock-Based and Deferred Compensation Plans Stock Option & SARS activity (Tables)
 12 Months Ended
Dec. 31, 2018
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:
 
2018
 
2017
 
2016
 
 
 
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,
181

 
$
17.10

 
390

 
$
20.00

 
776

 
$
19.27

Exercised
(19
)
 
8.68

 
(35
)
 
15.76

 
(236
)
 
16.12

Forfeited
(9
)
 
17.05

 
(35
)
 
21.58

 
(11
)
 
16.16

Expired
(2
)
 
8.35

 
(139
)
 
24.55

 
(139
)
 
22.79

Outstanding at December 31,
151

 
$
18.29

 
181

 
$
17.10

 
390

 
$
20.00

Expected to vest at December 31,
151

 
$
18.29

 
181

 
$
17.10

 
390

 
$
20.00

Exercisable at December 31,
151

 
$
18.29

 
181

 
$
17.10

 
330

 
$
20.56

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

 
 
 
$
0.2

 
 
 
$
0.4

 
 
Tax benefit related to compensation expense
$
—

 
 
 
$
(0.1
)
 
 
 
$
(0.1
)
 
 
Intrinsic value of awards exercised
$
0.1

 
 
 
$
0.2

 
 
 
$
1.8

 
 
Cash received from awards exercised
$
0.2

 
 
 
$
0.5

 
 
 
$
3.8

 
 
Grant date fair value of awards vested
$
—

 
 
 
$
0.3

 
 
 
$
0.5

 
 
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, 2018:
 
Outstanding
 
Exercisable
 
 
 
Weighted-
Average
Exercise
Price Per
Share
 
 
 
Weighted-
Average
Exercise
Price Per
Share
(in thousands, except per share amounts)
Shares
 
 
Shares
 
Range of Grant Price
 
 
 
 
 
 
 
$14.55 to $17.05
123

 
$
17.04

 
123

 
$
17.04

$23.75 to $26.05
28

 
23.83

 
28

 
23.83

Total
151

 
$
18.29

 
151

 
$
18.29
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:
 
2018
 
2017
 
2016
 
 
 
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,
871

 
$
17.30

 
954

 
$
15.89

 
721

 
$
16.77

Granted*
288

 
17.60

 
245

 
22.03

 
307

 
15.45

Vested
(308
)
 
15.45

 
(229
)
 
16.74

 
(51
)
 
22.75

Forfeited
(159
)
 
15.45

 
(99
)
 
16.62

 
(23
)
 
22.35

Non-vested at December 31,
692

 
$
18.67

 
871

 
$
17.30

 
954

 
$
15.89

 
 
 
 
 
 
 
 
 
 
 
 
(dollars in millions)
 
 
 
 
 
 
 
 
 
 
 
Compensation expense for the year
$
2.1

 
 
 
$
3.9

 
 
 
$
3.6

 
 
Tax benefit related to compensation expense
$
(0.5
)
 
 
 
$
(1.4
)
 
 
 
$
(1.3
)
 
 
Grant date fair value of awards vested
$
4.7

 
 
 
$
3.8

 
 
 
$
1.2

 
 
 
 
 
 
 
 
 
 
 
 
 
 
* 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: 
 
2018
 
2017
 
2016
 
 
 
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,
164

 
$
18.57

 
106

 
$
16.75

 
47

 
$
19.59

Granted
245

 
17.05

 
96

 
20.78

 
106

 
16.75

Awards converted pursuant to Hawaiian Telcom acquisition
149

 
15.70

 
—

 
—

 
—

 
—

Vested
(61
)
 
18.08

 
(38
)
 
19.10

 
(47
)
 
19.59

Non-vested at December 31,
497

 
$
17.02

 
164

 
$
18.57

 
106

 
$
16.75

 
 
 
 
 
 
 
 
 
 
 
 
(dollars in millions)
 
 
 
 
 
 
 
 
 
 
 
Compensation expense for the year
$
3.5

 
 
 
$
1.8

 
 
 
$
1.1

 
 
Tax benefit related to compensation expense
$
(0.8
)
 
 
 
$
(0.6
)
 
 
 
$
(0.4
)
 
 
Grant date fair value of awards vested
$
1.1

 
 
 
$
0.7

 
 
 
$
0.9