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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 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, 2015 and changes during the year ended December 31, 2015 is presented below:
 
Number of Shares
 
Weighted-Average
Grant Date Fair Value ($)
Outstanding at December 31, 2014
363,891

 
38.83

Granted
74,772

 
75.40

Vested
(132,108
)
 
34.94

Forfeited
(11,875
)
 
55.45

Outstanding at December 31, 2015
294,680

 
49.19
Summary of share option activity
A summary of share option activity as of December 31, 2015 and changes during the year ended December 31, 2015 is presented below:
 
Number
of Options
 
Weighted-
Average
Exercise
Price ($)
 
Average
Remaining
Contractual
Term
(Years)
 
Aggregate
Intrinsic
Value
($000)
Outstanding at December 31, 2014
31,625

 
8.32

 
5.7
 
2,126

Exercised
(3,500
)
 
9.23

 
 
 
 
Forfeited or expired
—

 
—

 
 
 
 
Outstanding at December 31, 2015
28,125

 
8.20

 
4.7
 
890

Exercisable at December 31, 2015
28,125

 
8.20

 
4.7
 
890

Vested or Expected to Vest at December 31, 2015
28,125

 
8.20

 
4.7
 
890
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Performance share award activity
The following table summarizes the Company’s performance share awards for the year ended December 31, 2015:
 
Number of Awards
 
Weighted-Average Fair Value at Grant Date ($)
Outstanding at December 31, 2014
142,570

 
39.67

Granted
36,955

 
50.07

Vested
(92,747
)
 
43.64

Forfeited
—

 
—

Outstanding at December 31, 2015
86,778

 
66.44
Performance Shares Awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Multiple input variables of performance share awards
The grant date fair value of the performance share awards is determined through the use of a Monte Carlo simulation model, which utilizes multiple input variables that determine the probability of satisfying the market condition requirements applicable to each award as follows:
 
Weighted-Average at Grant Date for Twelve Months Ended December 31, 2015
 
Weighted-Average at Grant Date for Twelve Months Ended December 31, 2014
 
Expected volatility factor
0.36

 
0.42

 
Risk free interest rate
0.91

%
0.65

%
Expected term (in years)
2.55

 
2.77

 
Expected dividend yield
—

%
—

%