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Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2011
STOCK-BASED COMPENSATION: [Abstract]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block]
he fair value of share-based payment awards was estimated using the Black-Scholes option pricing model with the following assumptions and weighted average fair values:
 
 
December 31,
 
 
2011
 
2010
 
2009
Weighted average fair value of grants
 
$
20.47

 
$
21.97

 
$
14.48

Risk-free interest rate
 
1.61
%
 
1.88
%
 
1.45
%
Expected dividend yield
 
0.82
%
 
0.80
%
 
1.40
%
Expected forfeiture rate
 
2.00
%
 
2.00
%
 
2.00
%
Expected volatility
 
55.10
%
 
59.00
%
 
75.60
%
Expected term in years
 
4.26

 
4.04

 
4.10
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
A summary of the status of stock options granted is presented below:
 
 
 
 
 
 
Weighted
 
 
 
 
 
 
 
 
Average
 
 
 
 
 
 
Weighted
 
Remaining
 
Aggregate
 
 
 
 
Average
 
Contractual
 
Intrinsic
 
 
 
 
Exercise
 
Term (in
 
Value (in
 
 
Shares
 
Price
 
years)
 
thousands)
Balance at December 31, 2010
 
5,453,241

 
$
29.59

 
 
 
 
Granted
 
484,263

 
$
48.59

 
 
 
 
Exercised
 
(579,767
)
 
$
15.59

 
 
 
 
Forfeited
 
(22,227
)
 
$
36.32

 
 
 
 
Balance at December 31, 2011
 
5,335,510

 
$
32.79

 
4.67

 
$
51,962

Vested and expected to vest
 
5,325,845

 
$
32.76

 
4.85

 
$
51,961

Exercisable at December 31, 2011
 
4,339,329

 
$
29.75

 
4.00

 
$
49,382
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
 
 
Number of
 
Weighted Average
 
 
Shares
 
Grant Date Fair Value
Nonvested at December 31, 2010
 
1,168,444

 
$38.63
Granted
 
515,804

 
$48.24
Vested
 
(435,825
)
 
$37.85
Forfeited
 
(28,070
)
 
$44.70
Nonvested at December 31, 2011
 
1,220,353

 
$42.83
Schedule of Nonvested Performance-based Units Activity [Table Text Block]
The following represents the unvested performance share unit awards and their corresponding fair value (based upon the closing share price) at the date of grant:
 
 
Number of
 
Weighted Average
 
 
Shares
 
Grant Date Fair Value
Nonvested at December 31, 2010
 
338,013

 
$53.36
Granted
 
211,743

 
$55.01
Vested
 
(40,752
)
 
$86.41
Nonvested at December 31, 2011
 
509,004

 
$51.40
Schedule of Other Share-based Compensation, Activity [Table Text Block]
The following represents the unvested performance options and their corresponding fair value (based upon the closing share price) at the date of grant:
 
 
Number of
 
Weighted Average
 
 
Shares
 
Grant Date Fair Value
Nonvested at December 31, 2010
 
802,804

 
$16.44
Vested
 
(200,697
)
 
$16.44
Nonvested at December 31, 2011
 
602,107

 
$16.44