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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 the status of the Company's restricted stock shares A summary of the status of the Company’s restricted stock shares (restricted stock awards and restricted stock unit awards) as of December 31, 2017 and changes during the year ended December 31, 2017 is presented below:
 
Number of Shares
 
Weighted-Average
Grant Date Fair Value ($)
Outstanding at December 31, 2016
274,645

 
49.55

Granted
103,030

 
51.68

Vested
(88,580
)
 
47.64

Forfeited
(22,573
)
 
55.79

Outstanding at December 31, 2017
266,522

 
50.48
Summary of share option activity A summary of share option activity as of December 31, 2017 and changes during the year ended December 31, 2017 is presented below:
 
Number
of Options
 
Weighted-
Average
Exercise
Price ($)
 
Average
Remaining
Contractual
Term
(Years)
 
Aggregate
Intrinsic
Value
($000)
Outstanding at December 31, 2016
16,250

 
8.37

 
3.7
 
804

Exercised
(5,750
)
 
7.80

 
 
 
 
Forfeited or expired
—

 
—

 
 
 
 
Outstanding at December 31, 2017
10,500

 
8.68

 
2.7
 
380

Exercisable at December 31, 2017
10,500

 
8.68

 
2.7
 
380

Vested at December 31, 2017
10,500

 
8.68

 
2.7
 
380
Market Condition Performance Share Awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Multiple input variables of performance share awards The inputs utilized for the performance share awards based on total shareholder return are as follows:
 
Weighted-Average at Grant Date for Twelve Months Ended December 31, 2017
 
Weighted-Average at Grant Date for Twelve Months Ended December 31, 2016
 
Expected volatility factor
0.40

 
0.39

 
Risk free interest rate
1.47

%
1.12

%
Expected term (in years)
2.93

 
2.94

 
Expected dividend yield
—

%
—

%
Performance share award activity The following table summarizes the Company’s market condition performance share awards for the year ended December 31, 2017:
 
Number of Awards
 
Weighted-Average Fair Value at Grant Date ($)
Outstanding at December 31, 2016
133,907

 
50.54

Granted
89,338

 
48.86

Vested
(17,592
)
 
50.07

Forfeited
(85,294
)
 
45.64

Outstanding at December 31, 2017
120,359

 
52.84
Performance Condition Performance Share Awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Performance share award activity The following table summarizes the Company’s performance condition performance share awards for the year ended December 31, 2017:
 
Number of Awards
 
Weighted-Average Fair Value at Grant Date ($)
Outstanding at December 31, 2016
—

 
—

Granted
37,649

 
46.28

Vested
—

 
—

Forfeited
(2,142
)
 
55.50

Outstanding at December 31, 2017
35,507

 
45.72