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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of restricted stock units issued and compensation expense The following table summarizes RSUs issued and the compensation expense recorded for the years ended December 31, 2018, 2017 and 2016:
 
 
RSUs (a)
 
Weighted Average Fair Value
 
Expense
(Dollars in thousands, except per unit)
 
 
 
2018
 
2017
 
2016
Directors:
 
 
 
 
 
 
 
 
 
 
2015
 
59,985

 
$
15.69

 
—

 
—

 
314

2016
 
109,998

 
$
7.00

 
—

 
257

 
513

2017
 
56,203

 
$
13.70

 
179

 
641

 
—

2018
 
43,821

 
$
20.54

 
511

 
—

 
—

Employees:
 
 
 
 
 
 
 
 
 
 
2013
 
170,582

 
$
20.63

 
—

 
—

 
66

2014
 
190,832

 
$
25.21

 
—

 
316

 
669

2015
 
239,679

 
$
16.53

 
230

 
597

 
880

2016
 
536,773

 
$
7.09

 
935

 
1,011

 
995

2017
 
286,251

 
$
13.70

 
1,019

 
1,417

 
—

2018
 
242,791

 
$
19.93

 
1,656

 
—

 
—

Total
 
 

 
 

 
$
4,530

 
$
4,239

 
$
3,437

(a)
Represents number of awards originally issued.
Schedule of restricted stock unit activity RSU activity for the year ended December 31, 2018 was as follows:
 
 
Number of Shares
 
Weighted Average
Grant-Date
Fair Value
Non-vested at December 31, 2017
 
801,939

 
$
11.73

Granted
 
286,612

 
20.03

Vested
 
(478,917
)
 
12.48

Forfeited
 
(26,254
)
 
14.11

Non-vested at December 31, 2018
 
583,380

 
15.08
Schedule of Stock Appreciation Rights award activity SARs activity for the year ended December 31, 2018 was as follows:
 
 
Number of Shares
 
Weighted Average Exercise Price
 
Aggregate Intrinsic Value (in millions) (b)
Outstanding, December 31, 2017
 
1,679,276

 
$
15.40

 
$
7.9

Granted
 
229,440

 
19.99

 
 
Exercised
 
(150,013
)
 
17.88

 
 
Forfeited/Expired
 
(13,256
)
 
24.53

 
 
Outstanding, December 31, 2018
 
1,745,447

 
15.73

 
8.9


(b)
Intrinsic value is defined as the difference between the current market value and the exercise price, for those SARs where the market price exceeds the exercise price.
Schedule of nonvested awards activity The following table summarizes information concerning outstanding and exercisable SARs at December 31, 2018:
 
 
SARs Outstanding
 
SARs Exercisable
Range of exercisable prices
 
Vested
 
Non-vested
 
Weighted-Average Exercise Price per Share
 
Weighted-Average Remaining Contractual Life in Years
 
Number Exercisable
 
Weighted-Average Exercise Price per Share
$7.00 - $13.70
 
484,331

 
242,513

 
$
9.41

 
7.65
 
484,331

 
$
9.24

$16.53 - $22.70
 
532,700

 
217,343

 
18.58

 
6.78
 
532,700

 
18.08

$23.03 - $26.92
 
260,938

 
7,622

 
24.84

 
5.45
 
260,938

 
24.84

 
 
1,277,969

 
467,478

 
15.73

 
6.94
 
1,277,969

 
16.11
Stock Appreciation Rights (SARs)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of stock appreciation rights valuation assumptions he fair value of each SAR grant was estimated on the grant date using a Black-Scholes pricing model with the following assumptions:
 
 
Risk-free Interest rate
 
Dividend Yield
 
Expected Life (Years)
 
Volatility
 
SAR Grant Price
 
Fair Value of SAR
May 2016 Grant
 
1.39
%
 
—
%
 
6.0
 
42.1
%
 
7.00

 
2.93

November 2016 Grant
 
1.74
%
 
—
%
 
6.0
 
43.8
%
 
12.25

 
5.38

March 2017 Grant
 
2.17
%
 
—
%
 
6.0
 
43.9
%
 
13.70

 
6.13

March 2018 Grant
 
2.69
%
 
—
%
 
6.0
 
44.6
%
 
19.80

 
9.16

July 2018 Grant
 
2.87
%
 
—
%
 
6.0
 
44.7
%
 
24.65

 
11.48
Schedule of weighted-average grant-date fair value of unvested options Weighted-average grant date fair value of non-vested SARs for the year ended December 31, 2018 was as follows:
 
 
Number of Shares
 
Weighted-Average Grant Date Fair Value
Non-vested shares, December 31, 2017
 
877,417

 
$
4.42

Granted
 
229,440

 
9.17

Vested
 
(626,123
)
 
4.63

Forfeited
 
(13,256
)
 
7.51

Non-vested shares, December 31, 2018
 
467,478

 
6.65
Performance Stock Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of stock appreciation rights valuation assumptions The fair value of PSUs granted was estimated on the grant date using a Monte Carlo pricing model with the following assumptions:
 
 
Risk-free Interest rate
 
Dividend Yield
 
Expected Life (Years)
 
Volatility
 
Fair Value of PSU
May 2016 Grant
 
0.84
%
 
—
%
 
2.65
 
33.3
%
 
$
7.19

November 2016 Grant
 
0.96
%
 
—
%
 
2.14
 
35.2
%
 
17.84

March 2017 Grant
 
1.54
%
 
—
%
 
2.83
 
34.2
%
 
17.05

March 2018 Grant
 
2.36
%
 
—
%
 
2.83
 
34.7
%
 
29.56

July 2018 Grant
 
2.69
%
 
—
%
 
2.42
 
33.1
%
 
39.06
Schedule of weighted-average grant-date fair value of unvested options A summary of the Company's non-vested PSU activity during the year ending December 31, 2018 was as follows:
 
 
Number of Shares
 
Weighted-Average Grant Date Fair Value
Non-vested shares, December 31, 2017
 
743,583

 
$
10.91

Granted
 
240,008


29.83

Forfeited
 
(34,426
)

13.33

Vested, not issued (c)
 
(454,283
)
 
7.41

Non-vested shares, December 31, 2018
 
494,882


23.13