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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2013
Share-based Compensation [Abstract]  
Schedule Of Share Based Compensation Shares Authorized Under Stock Option Plans By Exercise Price Range And Intrinsic Value
The following table summarizes outstanding share options and exercisable options at December 31, 2013:
 
Outstanding Options (1)
 
Exercisable Options (1)
Range of Exercise Prices
Number
 
Weighted
Average
Price
 
Number
 
Weighted
Average
Price
$30.06-$41.16
228,012

 
$
33.14

 
130,107

 
$
35.46

$42.90-$43.94
108,947

 
43.43

 
108,947

 
43.43

$45.53-$62.32
297,402

 
47.39

 
297,402

 
47.39

Total options
634,361

 
$
41.59

 
536,456

 
$
43.69

(1)
The aggregate intrinsic value of outstanding and exercisable options at December 31, 2013 was approximately $9.8 million and $7.2 million, respectively. The aggregate intrinsic values were calculated as the excess, if any, between our closing share price of $56.88 per share on December 31, 2013 and the strike price of the underlying award.
Summary Of Share Incentive Plans
The following table summarizes activity under our share incentive plans for the three years ended December 31:
 
 
Options
Outstanding
 
Weighted
Average
Exercise  /
Grant Price
 
Nonvested
Share
Awards
Outstanding
 
Weighted
Average
Exercise  /
Grant Price
Options and nonvested share awards outstanding at December 31, 2010
1,847,136

 
$
42.37

 
741,505

 
$
42.16

Granted
—

 
—

 
347,084

 
57.00

Exercised/Vested
(504,838
)
 
42.59

 
(243,874
)
 
47.19

Forfeited
(2,762
)
 
48.02

 
(25,961
)
 
44.51

Balance at December 31, 2011
1,339,536

 
$
42.27

 
818,754

 
$
46.88

Granted
—

 
—

 
346,330

 
63.51

Exercised/Vested
(468,839
)
 
40.86

 
(282,552
)
 
49.28

Forfeited
(31,943
)
 
60.56

 
(20,279
)
 
52.05

Balance at December 31, 2012
838,754

 
$
42.36

 
862,253

 
$
52.64

Granted
—

 
—

 
350,615

 
69.56

Exercised/Vested
(183,871
)
 
41.56

 
(309,396
)
 
51.41

Forfeited
(20,522
)
 
73.32

 
(72,174
)
 
58.08

Total options and nonvested share awards outstanding at December 31, 2013
634,361

 
$
41.59

 
831,298

 
$
59.77
Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block]
The following table presents information related to our ESPP:
 
2013
 
2012
 
2011
Shares purchased
17,171

 
20,137

 
19,914

Weighted average fair value of shares purchased
$
62.59

 
$
67.80

 
$
63.29

Expense recorded (in millions)
$
0.2

 
$
0.3

 
$
0.3
Temporary Equity [Table Text Block]
The following table summarizes the eligible share award activity as recorded in temporary equity from July 31, 2013, the effective date of the amended and restated Plan, through December 31, 2013:
(in thousands)
 
 
Temporary equity:
 
 
Effective date of amended and restated plan at July 31, 2013
 
$
—

Change in classification of share awards
 
37,958

Change in redemption value of share awards
 
9,575

Diversification of share awards
 
(353
)
Non-qualified deferred compensation share awards at December 31, 2013
 
$
47,180