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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Share-Based Compensation Expense By Type [Table Text Block]
Share-based compensation expense (income) was as follows:
 
Year Ended December 31,
 
2019
 
2018
 
2017
PUs
$
277

 
$
(3,925
)
 
$
12,145

RSUs
8,432

 
9,241

 
9,183

Stock options
3,156

 
3,204

 
3,635

Total
$
11,865

 
$
8,520

 
$
24,963
Schedule of Share-based Compensation, Stock Options, Activity
Stock option transactions and related information for the year ended December 31, 2019 was as follows:
 
Options    
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Life (Years)
 
Aggregate Intrinsic Value
Outstanding as of January 1, 2019
473,245

 
$
79.35

 
 
 
 
Granted
174,874

 
$
72.27

 
 
 
 
Exercised
(17,175
)
 
$
29.83

 
 
 
 
Forfeited
(42,843
)
 
$
92.07

 
 
 
 
Expired
(39,331
)
 
$
78.81

 
 
 
 
Outstanding as of December 31, 2019
548,770

 
$
77.68

 
6.7
 
$
74

Exercisable as of December 31, 2019
322,018

 
$
72.72

 
5.3
 
$
74
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions The fair value of each option was estimated using the following assumptions:
 
2019
 
2018
 
2017
Expected volatility
29.48% - 31.10%

 
27.17% - 27.19%

 
27.38% - 27.47%

Dividend yield
0.00
%
 
0.00
%
 
0.00
%
Expected option life - years
6.0

 
6.0

 
6.0

Risk-free rate
1.8% - 2.5%

 
2.6%

 
1.9% - 2.1%
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
Restricted stock and restricted stock units transactions and related information for the year ended December 31, 2019 was as follows:
 
Restricted Stock and Restricted Units
 
Weighted Average Grant Date Fair Value
Non-vested as of January 1, 2019
313,345

 
$
94.75

Granted
207,538

 
$
66.12

Vested
(129,342
)
 
$
83.87

Forfeited
(58,560
)
 
$
91.48

Non-vested as of December 31, 2019
332,981

 
$
83.60
Schedule of Nonvested Performance-based Units Activity [Table Text Block]
A summary of activity for performance-vested restricted stock units transactions and related information for the year ended December 31, 2019 was as follows:
 
Performance Units
 
Weighted Average Grant Date Fair Value
Non-vested as of January 1, 2019
191,854

 
$
91.46

Granted
110,823

 
$
78.41

Vested
(75,382
)
 
$
72.30

Forfeited
(33,242
)
 
$
91.02

Non-vested as of December 31, 2019
194,053

 
$
93.86
Schedule of Share-based Payment Award, TSRs, Valuation Assumptions [Table Text Block]
TSR Awards
In 2016, the Company granted performance awards to certain of the Company’s executive officers. These grants were to be settled in shares of the Company’s stock and vested over a three-year performance period. The payout of these awards was based on the Company’s relative total shareholder return (“TSR”) compared to a pre-established comparator group during the performance period. These awards expired in 2019 with no payout, and there were no outstanding TSR-based performance awards as of December 31, 2019.