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Share-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2013
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, 2013
 
Number
of Shares
 
Weighted-Average
Grant-Date Fair Value
Unvested at beginning of year
132

 
$
36.60

Granted
49

 
69.72

Forfeited
(2
)
 
56.06

Vested
(82
)
 
26.61

Unvested at end of year
97

 
$
61.48
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: 
 
Year Ended December 31,
 
2013
 
2012
 
2011
Weighted-average grant-date fair value per share
$
41.52

 
$
35.69

 
$
24.33

Expected term (years)
6.25

 
6.25

 
6.25

Risk-free interest rate
1.00
%
 
1.15
%
 
2.43
%
Expected volatility
66.80
%
 
70.71
%
 
72.47
%
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, 2013
 
Number
of Shares
 
Weighted-average
Exercise
Price
 
Aggregate Intrinsic Value
 
Weighted- average Remaining Contractual Term
Outstanding at beginning of year
749

 
$
24.21

 
 
 
 
Granted
82

 
68.21

 
 
 
 
Exercised
(315
)
 
16.97

 
 
 
 
Forfeited
(6
)
 
43.17

 
 
 
 
Outstanding at end of year
510

 
$
35.54

 
$
30,676

 
6.5 years
Vested and expected to vest at end of year
504

 
$
35.27

 
$
30,446

 
6.5 years
Exercisable at end of year
236

 
$
21.61

 
$
17,460

 
5.1 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, 2013
 
Number
of Shares
 
Weighted-Average
Grant-Date Fair Value
Unvested at beginning of year
68

 
$
41.07

Granted
19

 
68.21

Forfeited
(1
)
 
36.45

Unvested at end of year
86

 
$
46.94
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, 2013
 
Number
of Shares
 
Weighted-average
Grant-Date Fair Value
Unvested at beginning of year
18

 
$
67.05

Granted
22

 
80.34

Unvested at end of year
40

 
$
74.36