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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The following table summarizes weighted-average assumptions used in our calculations of fair value for the nine months ended September 30, 2019:
 
Nine months ended
September 30, 2019
Volatility
27.00
%
Expected life of options
3 years

Risk-free interest rate
2.38
%
Dividend yield
2.00
%
Share-based Payment Arrangement, Option, Activity [Table Text Block]
The following table summarizes stock option activity for the year ended December 31, 2019 and the nine months ended September 30, 2020:
 
Number of Shares
 
Weighted Average Exercise Price
 
Aggregate Intrinsic Value
(in thousands)
 
Weighted Average Remaining Contractual Life
Stock options outstanding at December 31, 2018
1,093,400

 
$
45.34

 
$
8,776

 
 
Granted
489,947

 
$
63.87

 
 
 
 
Exercised
(338,748
)
 
$
37.94

 
$
9,641

 
 
Cancelled and expired
(108,504
)
 
$
51.21

 
 
 
 
Stock options outstanding at December 31, 2019
1,136,095

 
$
54.98

 
$
28,291

 
 
Exercised
(127,467
)
 
$
46.43

 
$
3,900

 
 
Cancelled and expired
(120,639
)
 
$
61.06

 
 
 
 
Stock options outstanding at September 30, 2020
887,989

 
$
55.38

 
$
13,131

 
3 years
 
 
 
 
 
 
 
 
Stock options exercisable at September 30, 2020
359,836

 
$
46.62

 
$
8,013

 
2 years
Schedule of Non-vested Share Activity [Table Text Block]
The following table summarizes non-vested stock options for the nine months ended September 30, 2020:
 
Number of Shares
 
Weighted Average Fair Value
Non-vested stock options at December 31, 2019
845,555

 
$
10.88

Vested
(199,931
)
 
$
8.76

Cancelled
(117,471
)
 
$
11.62

Non-vested stock options at September 30, 2020
528,153

 
$
11.52
Restricted Stock [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Restricted Stock Activity [Table Text Block] The following table summarizes the restricted stock activity during the year ended December 31, 2019 and the nine months ended September 30, 2020.
 
Number of Shares
 
Weighted Average Fair Value
Non-vested restricted stock at December 31, 2018
20,000

 
$
52.83

Granted
24,000

 
$
62.66

Vested
(20,000
)
 
$
52.83

Non-vested restricted stock at December 31, 2019
24,000

 
$
62.66

Granted
24,000

 
$
71.11

Vested
(24,000
)
 
$
62.66

Non-vested restricted stock at September 30, 2020
24,000

 
$
71.11
Restricted Stock Units (RSUs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Restricted Stock Activity [Table Text Block] The following table summarizes the non-vested RSU activity during the year ended December 31, 2019 and the nine months ended September 30, 2020:
 
Number of Units
 
Weighted Average Fair Value
Non-vested RSUs at December 31, 2018
137,596

 
$
45.11

Granted
145,440

 
$
59.43

Vested
(60,915
)
 
$
42.75

Forfeited
(11,294
)
 
$
51.88

Non-vested RSUs at December 31, 2019
210,827

 
$
55.31

Granted
217,950

 
$
68.12

Vested
(44,836
)
 
$
54.03

Forfeited
(51,438
)
 
$
64.09

Non-vested RSUs at September 30, 2020
332,503

 
$
62.52