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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Restricted Stock Activity
The following table is a summary of restricted stock award activity:
 
Year Ended December 31,
 
2017
 
2016
 
2015
 
Shares
 
Weighted-
Average Grant
Date Fair Value
per Share
 
Shares
 
Weighted-
Average Grant
Date Fair Value
per Share
 
Shares
 
Weighted-
Average Grant
Date Fair Value
per Share
Outstanding at beginning of period
43,175

 
$
33.87

 
49,825

 
$
33.76

 
49,869

 
$
33.40

Granted
158,500

 
28.05

 
—

 
—

 
5,900

 
25.44

Vested
(40,225
)
 
34.49

 
(6,650
)
 
33.02

 
(5,944
)
 
22.55

Forfeited
—

 
—

 
—

 
—

 
—

 
—

Outstanding at end of period(1)(2)
161,450

 
$
28.00

 
43,175

 
$
33.87

 
49,825

 
$
33.76

_______________________________________________________________________________
(1)
As of December 31, 2017, the aggregate intrinsic value was $4.6 million and was calculated by multiplying the closing market price of the Company's stock on December 31, 2017 by the number of non-vested restricted stock awards outstanding.
(2)
As of December 31, 2017, the weighted average remaining contractual term of non-vested restricted stock awards outstanding was 1.4 years.
The following table is a summary of restricted stock unit activity:
 
Year Ended December 31,
 
2017
 
2016
 
2015
 
Shares
 
Weighted-
Average Grant
Date Fair Value
per Share
 
Shares
 
Weighted-
Average Grant
Date Fair Value
per Share
 
Shares
 
Weighted-
Average Grant
Date Fair Value
per Share
Outstanding at beginning of period
348,538

 
$
15.01

 
425,438

 
$
13.81

 
604,214

 
$
12.48

Granted and fully vested
59,025

 
23.04

 
69,302

 
20.62

 
51,292

 
27.87

Issued
—

 
—

 
(146,202
)
 
14.17

 
(230,068
)
 
13.45

Forfeited
—

 
—

 
—

 
—

 
—

 
—

Outstanding at end of period(1)(2)
407,563

 
$
16.17

 
348,538

 
$
15.01

 
425,438

 
$
13.81

_______________________________________________________________________________
(1)
As of December 31, 2017, the aggregate intrinsic value was $11.7 million and was calculated by multiplying the closing market price of the Company's stock on December 31, 2017 by the number of outstanding restricted stock units.
(2)
Due to the immediate vesting of the units and the unknown term of each director, the weighted-average remaining contractual term in years has not been provided.
Summary of SAR activity
The following table is a summary of SAR activity:
 
Year Ended December 31,
 
2017
 
2016
 
2015
 
Shares
 
Weighted-
Average
Exercise
Price
 
Shares
 
Weighted-
Average
Exercise
Price
 
Shares
 
Weighted-
Average
Exercise
Price
Outstanding at beginning of period
483,286

 
$
13.04

 
558,546

 
$
12.52

 
667,764

 
$
12.63

Granted
—

 
—

 
—

 
—

 
—

 
—

Exercised
(426,142
)
 
12.43

 
(75,260
)
 
9.19

 
(109,218
)
 
13.19

Forfeited or expired
—

 
—

 
—

 
—

 
—

 
—

Outstanding at end of period(1)
57,144

 
$
17.59

 
483,286

 
$
13.04

 
558,546

 
$
12.52

Exercisable at end of period(2)
57,144

 
$
17.59

 
483,286

 
$
13.04

 
558,546

 
$
12.52

_______________________________________________________________________________
(1)
The intrinsic value of a SAR is the amount which the current market value of the underlying stock exceeds the exercise price of the SAR. As of December 31, 2017, the aggregate intrinsic value and weighted-average remaining contractual term of SARs outstanding was $0.6 million and 1.1 years, respectively.
(2)
As of December 31, 2017, the aggregate intrinsic value and weighted-average remaining contractual term of SARs exercisable was $0.6 million and 1.1 years, respectively.
Schedule of Performance Share Awards Activity
The following table is a summary of activity for the TSR Performance Share Awards:
 
Year Ended December 31,
 
2017
 
2016
 
2015
 
Shares
 
Weighted-
Average Grant
Date Fair Value
per Share(1)
 
Shares
 
Weighted-
Average Grant
Date Fair Value
per Share(1)
 
Shares
 
Weighted-
Average Grant
Date Fair Value
per Share(1)
Outstanding at beginning of period
885,213

 
$
21.62

 
732,286

 
$
23.82

 
674,787

 
$
22.42

Granted
409,380

 
19.85

 
407,907

 
18.57

 
292,421

 
19.29

Issued and fully vested
(157,147
)
 
32.04

 
(254,980
)
 
23.06

 
(234,922
)
 
14.16

Forfeited
(27,738
)
 
32.04

 
—

 
—

 
—

 
—

Outstanding at end of period
1,109,708

 
$
19.23

 
885,213

 
$
21.62

 
732,286

 
$
23.82

_________________________________________________________________________
(1) The grant date fair value figures in this table represent the fair value of the equity component of the performance share awards.
The following table is a summary of activity for the Hybrid Performance Share Awards:
 
Year Ended December 31,
 
2017
 
2016
 
2015
 
Shares
 
Weighted-
Average Grant
Date Fair Value
per Share
 
Shares
 
Weighted-
Average Grant
Date Fair Value
per Share
 
Shares
 
Weighted-
Average Grant
Date Fair Value
per Share
Outstanding at beginning of period
479,784

 
$
25.12

 
372,385

 
$
30.37

 
329,061

 
$
29.27

Granted
272,920

 
22.60

 
271,938

 
20.49

 
194,947

 
27.71

Issued and fully vested
(178,350
)
 
29.01

 
(164,539
)
 
29.34

 
(151,623
)
 
24.56

Forfeited
—

 
—

 
—

 
—

 
—

 
—

Outstanding at end of period
574,354

 
$
22.72

 
479,784

 
$
25.12

 
372,385

 
$
30.37

The following table is a summary of activity for Employee Performance Share Awards:
 
Year Ended December 31,
 
2017
 
2016
 
2015
 
Shares
 
Weighted-
Average Grant
Date Fair Value
per Share
 
Shares
 
Weighted-
Average Grant
Date Fair Value
per Share
 
Shares
 
Weighted-
Average Grant
Date Fair Value
per Share
Outstanding at beginning of period
993,530

 
$
27.26

 
925,590

 
$
30.23

 
1,088,960

 
$
25.18

Granted
406,460

 
22.60

 
435,990

 
20.49

 
349,780

 
27.71

Issued and fully vested
(225,780
)
 
39.43

 
(340,960
)
 
26.62

 
(504,620
)
 
17.59

Forfeited
(78,240
)
 
23.20

 
(27,090
)
 
27.77

 
(8,530
)
 
31.11

Outstanding at end of period
1,095,970

 
$
23.31

 
993,530

 
$
27.26

 
925,590

 
$
30.23
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award
The following assumptions were used to determine the grant date fair value of the equity component of the TSR Performance Share Awards for the respective periods:
 
Year Ended December 31,
 
2017
 
2016
 
2015
Fair value per performance share award granted during the period
$
19.85

 
$
18.57

 
$
19.29

Assumptions
 

 
 

 
 

Stock price volatility
37.8
%
 
34.4
%
 
32.3
%
Risk free rate of return
1.4
%
 
0.9
%
 
1.0
%
Expected dividend yield
—
%
 
—
%
 
0.3
%

The following assumptions were used to determine the fair value of the liability component of the TSR Performance Share Awards for the respective periods:
 
December 31,
 
2017
 
2016
 
2015
Fair value per performance share award at the end of the period
$13.23 - $21.64
 
$5.59 - $7.10
 
$2.49 - $6.39
Assumptions
 
 
 
 
 
Stock price volatility
29.1% - 36.7%
 
40.4% - 43.0%
 
33.5% - 37.5%
Risk free rate of return
1.8% - 1.9%
 
0.9% - 1.2%
 
0.7% - 1.1%
Expected dividend yield
—%
 
—%
 
—%