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Share Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share Based Compensation Plans
Share Award Transactions. The following transactions have occurred in connection with the Company’s share based compensation plans during the years ended December 31:
 
2016
 
2015
 
2014
Restricted stock awards granted
137,258

 
135,150

 
150,145

Restricted stock awards forfeited
(2,867
)
 
—

 
(1,325
)
Director stock awards granted
3,125

 
3,375

 
2,625

Restricted Stock Unit Activities:
 
 
 
 
 
Shares released from Deferred Compensation Plan
—

 
(217
)
 
(216
)
Stock Option Activities:
 
 
 
 
 
Outstanding as of the beginning of year
1,690,899

 
1,546,508

 
1,481,280

Granted
197,550

 
192,350

 
199,100

Exercised
(113,820
)
 
(40,461
)
 
(133,872
)
Forfeited
(18,760
)
 
—

 
—

Expired
(116,004
)
 
(7,498
)
 
—

Outstanding as of the end of year
1,639,865

 
1,690,899

 
1,546,508

Employee Stock Purchase Plans shares issued
41,924

 
39,384

 
30,622

Shares available for issuance under Share Incentive and Employee Stock Purchase Plans as of the end of year
522,341

 
764,567

 
1,127,328
Schedule Of Share-based Compensation, Restricted Stock And Restricted Stock Units Activity
During the year ended December 31, 2016, the number of shares and the weighted average grant price of restricted stock transactions were as follows:
 
Restricted Stock
 
Number of
Shares
 
Weighted
Average
Grant Price
Nonvested as of December 31, 2015
387,878

 
$
76.93

Granted
137,258

 
$
51.10

Vested
(141,457
)
 
$
76.37

Forfeited
(2,867
)
 
$
64.49

Nonvested as of December 31, 2016
380,812

 
$
67.92
Schedule Of Share-based Compensation, Stock Options, Activity
During the year ended December 31, 2016, the number of shares, the weighted average grant date fair value and the weighted average exercise price on stock option transactions were as follows:
 
Nonvested Options
 
Vested/Exercisable Options
 
Total Options
 
Number of
Shares
 
Weighted
Average
Grant Date
Fair Value
 
Number of
Shares
 
Weighted
Average
Exercise Price
 
Number of
Shares
 
Weighted
Average
Exercise Price
Outstanding, as of December 31, 2015
571,224

 
$
22.83

 
1,119,675

 
$
57.64

 
1,690,899

 
$
62.70

Granted
197,550

 
$
17.09

 
—

 
$
—

 
197,550

 
$
57.52

Vested
(219,542
)
 
$
22.98

 
219,542

 
$
71.76

 
—

 
$
—

Exercised
—

 
$
—

 
(113,820
)
 
$
48.58

 
(113,820
)
 
$
48.58

Forfeited
(18,760
)
 
$
22.72

 
—

 
$
—

 
(18,760
)
 
$
71.90

Expired
—

 
$
—

 
(116,004
)
 
$
60.85

 
(116,004
)
 
$
60.85

Outstanding, as of December 31, 2016
530,472

 
$
20.63

 
1,109,393

 
$
61.03

 
1,639,865

 
$
63.09