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Share Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share Based Compensation Plans
 
 
2013
 
2012
 
2011
Restricted stock awards granted
 
148,300

 
134,600

 
183,500

Restricted stock awards forfeited
 
(18,000
)
 
(2,120
)
 
(4,100
)
Director stock awards granted
 
2,500

 
4,000

 
4,000

Restricted Stock Unit Activities:
 
 
 
 
 
 
Outstanding as of the beginning of year
 
—

 
1,130

 
531

Granted
 
—

 
—

 
650

Converted to shares
 
—

 
(1,130
)
 
(51
)
Outstanding as of the end of year
 
—

 
—

 
1,130

Shares released from Deferred Compensation Plan
 
(1,692
)
 
—

 
(63
)
Stock Option Activities:
 
 
 
 
 
 
Outstanding as of the beginning of year
 
1,281,821

 
1,272,192

 
1,130,356

Granted(1)
 
529,912

 
173,700

 
290,960

Exercised
 
(328,077
)
 
(149,781
)
 
(146,169
)
Forfeited
 
(800
)
 
—

 
(1,920
)
Expired
 
(1,576
)
 
(14,290
)
 
(1,035
)
Outstanding as of the end of year
 
1,481,280

 
1,281,821

 
1,272,192

Employee Stock Purchase Plan shares issued
 
31,586

 
39,980

 
47,376

Shares available for issuance under Share Incentive and Employee Stock Purchase Plans as of the end of year
 
508,495

 
1,200,417

 
538,287
Schedule Of Share-based Compensation, Restricted Stock And Restricted Stock Units Activity
 
 
Restricted Stock
 
 
Number of
Shares
 
Weighted
Average
Grant Price
Nonvested as of December 31, 2012
 
180,930

 
$
92.85

Granted
 
148,300

 
$
68.23

Vested(1)(2)
 
(8,860
)
 
$
72.79

Forfeited
 
(18,000
)
 
$
81.78

Nonvested as of December 31, 2013(1)
 
302,370

 
$
70.61
Schedule Of Share-based Compensation, Stock Options, Activity
 
 
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, 2012
 
533,660

 
$
27.72

 
748,161

 
$
63.36

 
1,281,821

 
$
68.96

Granted(1)(2)
 
354,254

 
$
26.12

 
175,658

 
$
45.64

 
529,912

 
$
63.19

Vested(1)
 
(235,508
)
 
$
21.61

 
235,508

 
$
56.62

 
—

 
$
—

Exercised(1)
 
—

 
$
—

 
(328,077
)
 
$
51.17

 
(328,077
)
 
$
51.17

Forfeited(1)
 
(800
)
 
$
23.22

 
—

 
$
—

 
(800
)
 
$
72.84

Expired(1)
 
—

 
$
—

 
(1,576
)
 
$
72.04

 
(1,576
)
 
$
72.04

Outstanding, as of
December 31, 2013(1)
 
651,606

 
$
23.36

 
829,674

 
$
50.42

 
1,481,280

 
$
57.95