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Share-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
A summary of option activity for the three months ended March 31, 2015 is presented below:
 
Number of Options
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Term (in years)
 
Range of Exercise Prices
Outstanding at January 1, 2015
521,293

 
$
39.20

 
1.6
 
$
26.56

-
$
51.15

Outstanding at March 31, 2015
521,293

 
$
39.20

 
1.4
 
$
26.56

-
$
51.15

 
 
 
 
 
 
 
 
 
 
Fully vested options at March 31, 2015
521,293

 
$
39.20

 
1.4
 
 

 
 
Schedule of Nonvested Performance-based Units Activity [Table Text Block]
A summary of PSU activity for the three months ended March 31, 2015 is presented below:
 
Number of Performance Share Units
 
Weighted Average Grant Date Fair Value
Outstanding at January 1, 2015
254,651

 
$
132.86

Vested
(43,575
)
(1) 
97.44

Granted
50,256

 
112.30

Forfeited
(3,358
)
 
180.73

Outstanding at March 31, 2015
257,974

 
$
134.84



(1)
Based on the Company's market performance relative to that of a peer group, the actual number of shares of common stock issued upon vesting during the three months ended March 31, 2015 was zero
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
A summary of RSU activity for the three months ended March 31, 2015 is presented below:
 
Number of Restricted Share Units
 
Weighted Average Grant Date Fair Value
Outstanding at January 1, 2015
293,651

 
$
67.00

Vested
(92,628
)
 
65.48

Granted
100,682

 
74.36

Forfeited
(508
)
 
69.13

Outstanding at March 31, 2015
301,197

 
$
69.92