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Share-based Compensation (Tables)
6 Months Ended
Jun. 30, 2020
Share-based Compensation [Abstract]  
Stock Option Activity

The following table is a summary of our stock option activity:

​

​

​

​

​

​

​

​

​

​

​

​

Six months ended June 30,

​

2020

​

2019

​

Awards

​

Weighted-Average Exercise Price

​

Awards

​

Weighted-Average Exercise Price

(awards in thousands)

​

​

​

​

​

​

​

​

​

Outstanding at beginning of period

97

​

$

52.53

​

107

​

$

49.26

Exercised

(21)

​

​

57.91

​

(10)

​

​

28.21

Forfeited

(6)

​

​

68.84

​

-

​

​

-

Outstanding at end of the period

70

​

$

49.36

​

97

​

$

52.53

Exercisable at end of the period

51

​

$

42.15

​

52

​

$

40.96

Restricted Stock Activity

​

​

​

​

​

​

​

​

​

​

​

Six months ended June 30,

​

2020

​

2019

​

Shares

​

Weighted-Average Grant Date Fair Value

​

Shares

​

Weighted-Average Grant Date Fair Value

(shares in thousands)

​

​

​

​

​

​

​

​

​

Outstanding at beginning of period

46

​

$

98.28

​

57

​

$

50.55

Granted

41

​

​

111.94

​

28

​

​

130.89

Vested

(29)

​

​

82.99

​

(31)

​

​

45.30

Forfeited

(4)

​

​

107.50

​

(2)

​

​

167.48

Outstanding at end of the period

54

​

$

116.00

​

52

​

$

92.36