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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of stock option activity
The following summarizes all stock option activity during the years ended December 31, 2015, 2014, and 2013:
In thousands
 
Number of
Shares
 
Weighted-
Average
Option
Price
 
Weighted-
Average
Remaining
Contractual
Term
(Years)
 
Aggregate
Intrinsic
Value
(Thousands)
Options outstanding at December 31, 2012
 
5,106,629

 
$
14.32

 
 
 
 

 
 
 
 
 
 
 
 
 
Granted in 2013
 
1,138,600

 
8.30

 
 
 
 

Exercised in 2013
 
(151,875
)
 
6.04

 
 
 
$
268

Unvested options forfeited in 2013
 
(762,062
)
 
11.97

 
 
 
 

Vested options expired in 2013
 
(1,085,580
)
 
13.47

 
 
 
 

Options outstanding at December 31, 2013
 
4,245,712

 
$
13.65

 
 
 
 

 
 
 
 
 
 
 
 
 
Granted in 2014
 
1,002,955

 
8.01

 
 
 
 

Exercised in 2014
 
(78,125
)
 
6.19

 
 
 
$
61

Unvested options forfeited in 2014
 
(437,984
)
 
8.72

 
 
 
 

Vested options expired in 2014
 
(268,537
)
 
17.83

 
 
 
 

Options outstanding at December 31, 2014
 
4,464,021

 
$
11.50

 
 
 
 

 
 
 
 
 
 
 
 
 
Granted in 2015
 
1,973,606

 
5.73

 
 
 
 

Exercised in 2015
 
(35,000
)
 
6.04

 
 
 
$
67

Unvested options forfeited in 2015
 
(660,733
)
 
7.96

 
 
 
 

Vested options expired in 2015
 
(1,139,148
)
 
14.89

 
 
 
 

Options outstanding at December 31, 2015
 
4,602,746

 
$
8.74

 
6.13
 
$
—

 
 
 
 
 
 
 
 
 
Exercisable at December 31, 2015
 
1,779,288

 
$
12.73

 
3.99
 
$
—
Summary of information of stock options outstanding
The following table summarizes information about stock options outstanding at December 31, 2015:
Range of
Exercise
Prices
 
Number
Outstanding
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Life (Years)
 
Number
Exercisable
 
Weighted-
Average
Exercise
Price
$
0.00

 -
6.99
 
1,605,866

 
$
4.72

 
3.54
 
221,520

 
$
6.10

$
7.00

 -
10.99
 
1,984,405

 
$
8.02

 
6.58
 
545,293

 
$
8.41

$
11.00

 -
11.99
 
397,000

 
$
11.90

 
3.95
 
397,000

 
$
11.90

$
12.00

 -
15.99
 
306,350

 
$
14.40

 
3.14
 
306,350

 
$
14.40

$
16.00

 -
24.49
 
50,000

 
$
17.30

 
2.00
 
50,000

 
$
17.30

$
24.50

 -
28.85
 
259,125

 
$
25.90

 
0.39
 
259,125

 
$
25.90

 
 
 
 
4,602,746

 
$
8.74

 
6.13
 
1,779,288

 
$
12.73
Schedule of weighted-average assumptions used to estimate fair value
The fair value of each option grant is estimated on the date of grant using the Black-Scholes Option-Pricing Model based on the following weighted-average assumptions used for grants during 2015, 2014, and 2013:
 
 
Year Ended December 31,
 
 
2015
 
2014
 
2013
Expected term (in years)
 
6.24

 
6.25

 
6.25

Expected stock price volatility
 
40.60
%
 
47.10
%
 
46.59
%
Risk-free interest rate
 
1.58
%
 
1.88
%
 
1.43
%
Expected dividend yield
 
5.69
%
 
3.82
%
 
4.74
%
Summary of unvested share activity
The following summarizes all unvested share activity during 2015, 2014, and 2013:
 
 
Number of
Shares
 
Weighted-
Average Grant
Date Fair Value
Unvested shares outstanding at December 31, 2012
 
500,453

 
$
10.95

 
 
 
 
 
Granted in 2013
 
591,931

 
8.02

Vested in 2013
 
(297,375
)
 
11.01

Forfeited in 2013
 
(108,964
)
 
8.94

Unvested shares outstanding at December 31, 2013
 
686,045

 
$
8.72

 
 
 
 
 
Granted in 2014
 
529,426

 
7.90

Vested in 2014
 
(342,613
)
 
8.98

Forfeited in 2014
 
(82,720
)
 
8.37

Unvested shares outstanding at December 31, 2014
 
790,138

 
$
8.10

 
 
 
 
 
Granted in 2015
 
836,775

 
6.38

Vested in 2015
 
(504,686
)
 
8.23

Forfeited in 2015
 
(159,781
)
 
7.90

Unvested shares outstanding at December 31, 2015
 
962,446

 
$
6.57
Summary of performance stock unit activity
The following summarizes all performance stock unit activity during 2015, 2014, and 2013:
 
 
Number of
Shares
 
Weighted-
Average Grant-Date Fair Value
Performance stock units outstanding at December 31, 2012
 
239,700

 
$
10.25

 
 
 
 
 
Granted in 2013
 
333,000

 
7.76

Settled in 2013
 
—

 
—

Forfeited in 2013
 
(102,000
)
 
9.84

Performance stock units outstanding at December 31, 2013
 
470,700

 
$
8.58

 
 
 
 
 
Granted in 2014
 
308,507

 
7.09

Settled in 2014
 
—

 
—

Forfeited in 2014
 
(175,533
)
 
9.30

Performance stock units outstanding at December 31, 2014
 
603,674

 
$
7.61

 
 
 
 
 
Granted in 2015
 
669,839

 
4.30

Settled in 2015
 
—

 
—

Forfeited in 2015
 
(572,129
)
 
7.54

Performance stock units outstanding at December 31, 2015
 
701,384

 
$
4.51