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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2017
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, 2017, 2016, and 2015:
In thousands
 
Number of
Shares
 
Weighted-
Average
Exercise Price
 
Weighted- Average
Remaining Contractual
Term (Years)
 
Aggregate
Intrinsic Value (Thousands)
Options outstanding at December 31, 2014
 
446,365

 
$
114.99

 
 
 
 

 
 
 
 
 
 
 
 
 
Granted in 2015
 
197,318

 
57.26

 
 
 
 

Exercised in 2015
 
(3,500
)
 
60.40

 
 
 
$
67

Unvested options forfeited in 2015
 
(65,982
)
 
79.59

 
 
 
 

Vested options expired in 2015
 
(113,988
)
 
148.83

 
 
 
 

Options outstanding at December 31, 2015
 
460,213

 
$
87.36

 
 
 
 

 
 
 
 
 
 
 
 
 
Granted in 2016
 
15,037

 
26.15

 
 
 
 

Exercised in 2016
 

 

 
 
 
$

Unvested options forfeited in 2016
 
(57,014
)
 
75.74

 
 
 
 

Vested options expired in 2016
 
(47,689
)
 
160.61

 
 
 
 

Options outstanding at December 31, 2016
 
370,547

 
$
77.23

 
 
 
 

 
 
 
 
 
 
 
 
 
Granted in 2017
 
33,855

 
10.00

 
 
 
 

Exercised in 2017
 

 

 
 
 
$

Unvested options forfeited in 2017
 
(9,872
)
 
73.31

 
 
 
 

Vested options expired in 2017
 
(85,563
)
 
110.44

 
 
 
 

Options outstanding at December 31, 2017
 
308,967

 
$
60.80

 
5.86
 
$

 
 
 
 
 
 
 
 
 
Vested and expected to vest at December 31, 2017
 
308,967

 
$
60.80

 
5.86
 
$

 
 
 
 
 
 
 
 
 
Exercisable at December 31, 2017
 
201,594

 
$
75.42

 
4.66
 
$

Summary of information of stock options outstanding
The following table summarizes information about stock options outstanding at December 31, 2017:
Range of
Exercise Prices
 
Number
Outstanding
 
Weighted-Average
Exercise Price
 
Weighted-Average
Remaining Life (Years)
 
Number
Exercisable
 
Weighted-Average
Exercise Price
$
0.00

 -
29.99
 
48,892

 
$
14.97

 
9.39
 
3,759

 
$
26.15

$
30.00

 -
54.99
 
96,866

 
38.39

 
7.73
 
48,433

 
38.39

$
55.00

 -
79.99
 
94,903

 
70.27

 
3.96
 
85,785

 
69.57

$
80.00

 -
104.99
 
30,941

 
88.28

 
5.34
 
26,253

 
89.35

$
105.00

 -
129.99
 
22,900

 
119.73

 
2.23
 
22,900

 
119.73

$
130.00

 -
159.99
 
14,465

 
151.51

 
0.70
 
14,465

 
151.51

 
 
 
 
308,967

 
$
60.80

 
5.86
 
201,595

 
$
75.42

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 2017, 2016, and 2015:
 
 
Year Ended December 31,
 
 
2017
 
2016
 
2015
Expected term (in years)
 
6.25

 
6.25

 
6.24

Expected stock price volatility
 
53.70
%
 
44.80
%
 
40.60
%
Risk-free interest rate
 
2.16
%
 
1.48
%
 
1.58
%
Expected dividend yield
 
%
 
%
 
5.69
%
Summary of cash stock appreciation rights
 
 
Number of
Units
 
Weighted-
Average 
Exercise Price
 
Weighted-Average
Remaining
Contractual Term
(Years)
Cash stock appreciation rights outstanding at December 31, 2016
 

 
$

 
 
 
 
 
 
 
 
 
Granted in 2017
 
86,618

 
9.70

 
 
Exercised in 2017
 

 

 
 
Forfeited in 2017
 

 

 
 
Cash stock appreciation rights outstanding at December 31, 2017
 
86,618

 
$
9.70

 
9.48
 
 
 
 
 
 
 
Vested and expected to vest at December 31, 2017
 
86,618

 
$
9.70

 
9.48
 
 
 
 
 
 
 
Exercisable at December 31, 2017
 

 
$

 
0.00
Schedule of weighted average assumptions used to estimate fair value of cash stock appreciation rights
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 2017:
 
 
2017
Expected term (in years)
 
6.25

Expected stock price volatility
 
54.45
%
Risk-free interest rate
 
2.23
%
Expected dividend yield
 
%
Summary of unvested share activity
The following summarizes all unvested share activity during 2017, 2016, and 2015:
 
 
Number of
Shares
 
Weighted-
Average Grant
Date Fair Value
Unvested shares outstanding at December 31, 2014
 
79,007

 
$
80.89

 
 
 
 
 
Granted in 2015
 
83,626

 
63.80

Vested in 2015
 
(50,507
)
 
82.27

Forfeited in 2015
 
(15,911
)
 
78.39

Unvested shares outstanding at December 31, 2015
 
96,215

 
$
65.69

 
 
 
 
 
Granted in 2016
 
74,192

 
26.32

Vested in 2016
 
(36,492
)
 
66.96

Forfeited in 2016
 
(39,372
)
 
57.79

Unvested shares outstanding at December 31, 2016
 
94,543

 
$
37.59

 
 
 
 
 
Granted in 2017
 
160,962

 
9.81

Vested in 2017
 
(40,979
)
 
41.39

Forfeited in 2017
 
(13,304
)
 
27.84

Unvested shares outstanding at December 31, 2017
 
201,222

 
$
15.23

Summary of phantom stock unit activity
The following summarizes all phantom stock unit activity during 2017:
 
 
Number of
Units
 
Weighted-
Average Grant
Date Fair Value
Phantom stock units outstanding at December 31, 2015
 

 
$

 
 
 
 
 
Granted in 2016
 
78,140

 
26.90

Vested in 2016
 

 

Forfeited in 2016
 
(24,976
)
 
26.90

Phantom stock units outstanding at December 31, 2016
 
53,164

 
$
26.90

 
 
 
 
 
Granted in 2017
 
56,000

 
9.70

Vested in 2017
 
(12,483
)
 
26.90

Forfeited in 2017
 
(14,644
)
 
22.63

Phantom stock units outstanding at December 31, 2017
 
82,037

 
$
15.92

Summary of performance stock unit activity
The following summarizes all performance stock unit activity during 2017, 2016, and 2015:
 
 
Number of
Units
 
Weighted-
Average Grant-Date Fair Value
Performance stock units outstanding at December 31, 2014
 
60,363

 
$
76.07

 
 
 
 
 
Granted in 2015
 
66,982

 
43.02

Settled in 2015
 

 

Forfeited in 2015
 
(57,211
)
 
75.40

Performance stock units outstanding at December 31, 2015
 
70,134

 
$
45.05

 
 
 
 
 
Granted in 2016
 
47,300

 
19.00

Settled in 2016
 

 

Forfeited in 2016
 
(33,004
)
 
57.59

Performance stock units outstanding at December 31, 2016
 
84,430

 
$
25.56

 
 
 
 
 
Granted in 2017
 
89,124

 
9.95

Settled in 2017
 

 

Forfeited in 2017
 
(10,494
)
 
47.90

Performance stock units outstanding at December 31, 2017
 
163,060

 
$
15.59

Summary of cash performance unit activity
The following summarizes all performance stock unit activity during 2017:
 
 
Number of
Shares
 
Weighted-
Average Grant-Date Fair Value
Cash performance stock units outstanding at December 31, 2015
 

 
$

 
 
 
 
 
Granted in 2016
 
51,209

 
26.90

Settled in 2016
 

 

Forfeited in 2016
 
(6,812
)
 
26.90

Cash performance stock units outstanding at December 31, 2016
 
44,397

 
$
26.90

 
 
 
 
 
Granted in 2017
 
109,887

 
10.10

Settled in 2017
 

 

Forfeited in 2017
 
(3,778
)
 
26.90

Cash performance stock units outstanding at December 31, 2017
 
150,506

 
$
14.63