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Share-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
The following table summarizes the Company’s unvested restricted stock and restricted stock unit awards activity:
 
December 31, 2012
 
Number
of Shares
 
Weighted-Average
Grant-Date Fair Value
Unvested at beginning of year
171

 
$
23.53

Granted
44

 
60.80

Forfeited
(7
)
 
35.06

Vested
(76
)
 
21.89

Unvested at end of year
132

 
$
36.60
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Weighted-average grant date fair values of stock options and the assumptions used in estimating the fair values are as follows: 
 
2012
 
2011
 
2010
Weighted-average grant date fair value per share
$
35.69

 
$
24.33

 
$
12.03

Expected term (years)
6.25

 
6.25

 
6.25

Risk-free interest rate
1.15
%
 
2.43
%
 
2.46
%
Expected volatility
70.71
%
 
72.47
%
 
77.84
%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value
The following table summarizes the Company’s stock option activity:
 
 
December 31, 2012
 
Number
of Shares
 
Weighted-average
Exercise
Price
 
Aggregate Intrinsic Value
 
Weighted- average Remaining Contractual Term
Outstanding at beginning of year
978

 
$
16.69

 
 
 
 
Granted
103

 
56.06

 
 
 
 
Exercised
(316
)
 
11.13

 
 
 
 
Forfeited
(16
)
 
31.25

 
 
 
 
Outstanding at end of year
749

 
$
24.21

 
$
31,816

 
6.2 years
Exercisable at end of year
441

 
$
16.36

 
$
22,188

 
5.0 years
Performance Based Stock Awards [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Activity [Table Text Block]
The following table summarizes the Company’s performance unit awards activity:
 
December 31, 2012
 
Number
of Shares
 
Weighted-Average
Grant-Date Fair Value
Unvested at beginning of year
187

 
$
18.70

Granted
15

 
55.93

Forfeited
(6
)
 
21.56

Vested
(128
)
 
11.02

Unvested at end of year
68

 
$
41.07
Leveraged Restricted Stock Awards [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Activity [Table Text Block]
The following table summarizes the Company’s leveraged restricted share unit awards activity:
 
December 31, 2012
 
Number
of Shares
 
Weighted-average
Grant-Date Fair Value
Unvested at beginning of year
—

 
$
—

Granted
18

 
67.05

Unvested at end of year
18

 
$
67.05