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Stock Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2014
Stock Options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of stock option activity
A summary of the activity for the Company’s stock options for the years ended December 31, 2014, 2013 and 2012, is as follows (amounts in thousands, except per share data):

 
Year Ended December 31,
 
2014
 
2013
 
2012
 
Shares
 
Weighted Average Exercise Price
 
Shares
 
Weighted Average Exercise Price
 
Shares
 
Weighted Average Exercise Price
 
 
 
 
 
 
 
 
 
 
 
 
Outstanding, beginning of period
3,142

 
$
59.86

 
3,552

 
$
54.35

 
4,018

 
$
49.53

Granted
1,234

 
$
136.75

 
276

 
$
108.89

 
813

 
$
69.00

Exercised
(640
)
 
$
52.50

 
(543
)
 
$
51.22

 
(371
)
 
$
40.57

Canceled
(47
)
 
$
104.57

 
(143
)
 
$
50.54

 
(908
)
 
$
51.74

 
 
 
 
 
 
 
 
 
 
 
 
Outstanding, end of period
3,689

 
$
86.29

 
3,142

 
$
59.86

 
3,552

 
$
54.35

 
 
 
 
 
 
 
 
 
 
 
 
Weighted average remaining contractual life
7

years
 
7

years
 
8

years
 
 
 
 
 
 
 
 
 
 
 
 
Options exercisable, end of period
1,317

 
$
55.65

 
1,128

 
$
52.07

 
469

 
$
46.23

 
 
 
 
 
 
 
 
 
 
 
 
Weighted average fair value of options granted
$
55.08

 
 
 
$
41.52

 
 
 
$
28.17

 
 
Restricted Stock [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of restricted stock activity
A summary of the activity for the Company’s restricted stock for the years ended December 31, 2014, 2013 and 2012, is as follows (amounts in thousands, except per share data):

 
Year Ended December 31,
 
2014
 
2013
 
2012
 
Shares
 
Weighted Average Grant Price
 
Shares
 
Weighted Average Grant Price
 
Shares
 
Weighted Average Grant Price
 
 
 
 
 
 
 
 
 
 
 
 
Outstanding, beginning of period
653

 
$
56.14

 
928

 
$
54.16

 
1,115

 
$
45.72

Granted
9

 
$
138.57

 
13

 
$
101.81

 
244

 
$
60.48

Vested
(231
)
 
$
57.35

 
(280
)
 
$
51.62

 
(370
)
 
$
36.02

Canceled
—

 
$
—

 
(8
)
 
$
56.50

 
(61
)
 
$
35.25

 
 
 
 
 
 
 
 
 
 
 
 
Outstanding, end of period
431

 
$
57.24

 
653

 
$
56.14

 
928

 
$
54.16
Restricted Stock Units (RSUs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of restricted stock activity
A summary of the activity for the Company’s restricted stock units for the years ended December 31, 2014, 2013 and 2012, is as follows (amounts in thousands, except per share data):

 
Year Ended December 31,
 
2014
 
2013
 
2012
 
Shares
 
Weighted Average Grant Price
 
Shares
 
Weighted Average Grant Price
 
Shares
 
Weighted Average Grant Price
 
 
 
 
 
 
 
 
 
 
 
 
Outstanding, beginning of period
288

 
$
74.73

 
327

 
$
61.79

 
273

 
$
54.86

Granted
153

 
$
136.54

 
73

 
$
109.96

 
142

 
$
71.33

Vested
(104
)
 
$
70.23

 
(88
)
 
$
61.17

 
(52
)
 
$
56.59

Canceled
(12
)
 
$
112.53

 
(24
)
 
$
55.28

 
(36
)
 
$
54.47

 
 
 
 
 
 
 
 
 
 
 
 
Outstanding, end of period
325

 
$
104.01

 
288

 
$
74.73

 
327

 
$
61.79