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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule Of Estimated Weighted-Average Assumptions Of Stock Options

The Company uses the Black Scholes pricing model to value the option awards. The average fair value of stock options granted during the years ended December 31, 2019, 2018, and 2017 of $11.84, $14.68, and $19.36, respectively, was estimated using the following weighted-average assumptions:
 
Year Ended December 31,
 
2019
 
2018
 
2017
Risk-free interest rate
2.6
%
 
2.5
%
 
1.7
%
Expected life (years)
4.3

 
4.3

 
4.4

Expected stock volatility
38.1
%
 
37.2
%
 
35.1
%
Expected dividend yield
—
%
 
—
%
 
0.2
%
Stock-Options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary Of Stock Options Granted To Employees And Non-Employee Directors
A summary of the status of all stock options and RSU awards granted to employees and non-employee directors as of December 31, 2019 and changes during the year are presented in the table below:
 
December 31, 2019
 
Stock Options
 
RSU Awards
 
RSU MSPs
 
Shares
 
Weighted
Average
Exercise Price
 
Shares
 
Weighted
Average
Exercise Price
 
Shares
 
Weighted
Average
Exercise Price
Options and awards outstanding at beginning of period
742,658

 
$
50.26

 
226,683

 
$
45.66

 
72,113

 
$
32.25

Granted
153,726

 
$
33.63

 
205,291

 
$
32.92

 
56,379

 
$
22.53

Exercised
(6,516
)
 
$
38.89

 
(59,450
)
 
$
44.06

 
(16,866
)
 
$
28.81

Forfeited
(108,013
)
 
$
68.79

 
(97,565
)
 
$
39.99

 
(5,024
)
 
$
26.34

Expired
(69,355
)
 
$
52.35

 
—

 
 
 
—

 
—

Options and awards outstanding at end of period
712,500

 
$
43.76

 
274,959

 
$
38.51

 
106,602

 
$
28.06

Options and awards exercisable at end of period
457,778

 
$
46.12

 
5,689

 
$
51.71

 
5,446

 
$
31.90
RSU MSPs [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summarized Information About RSUs Outstanding
The following table summarizes information about equity awards outstanding at December 31, 2019:
 
Equity Awards Outstanding
 
Equity Awards Exercisable
(shares and aggregate intrinsic value in thousands)
Awards
 
Average Share Price *
 
Aggregate Intrinsic Value
 
Remaining Term **
 
Awards
 
Average Share Price *
 
Aggregate Intrinsic Value
 
Remaining Term **
Stock Options
712,500

 
43.76

 
$
4,042

 
4.1
 
457,778

 
46.12

 
$
1,874

 
3.2
Restricted Stock Unit Awards
274,959

 
38.51

 
$
12,714

 
1.7
 
5,689

 
51.71

 
$
263

 
0.5
RSU MSPs
106,602

 
28.06

 
$
1,938

 
1.4
 
5,446

 
31.90

 
$
78

 
0.1
* Weighted-average exercise price per share for options and weighted- average grant date price for RSUs.

** Weighted-average contractual remaining term in years.