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Equity Schedule of share-based compensation activity (Tables)
 12 Months Ended
Dec. 31, 2012
Equity [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
The following tables summarize stock options, SARs and non-vested restricted stock activity for the years ended December 31, 2012, 2011, and 2010:

  
For the Year Ended December 31,
 
2012
 
2011
 
2010
 
Stock
Options
and
SARs
 
Weighted-
Average
Exercise
Price
 
Stock
Options
and
SARs
 
Weighted-
Average
Exercise
Price
 
Stock
Options
and
SARs
 
Weighted-
Average
Exercise
Price
Outstanding, beginning of year
1,327,066

 
$
18.72

 
1,924,133

 
$
21.16

 
1,799,465

 
$
22.68

Granted
157,983

 
22.32

 
146,000

 
18.63

 
302,000

 
11.88

Exercised
(427,348
)
 
13.18

 
(32,001
)
 
6.99

 
(26,998
)
 
11.96

Canceled
(268,953
)
 
23.29

 
(711,066
)
 
25.83

 
(150,334
)
 
22.34

Outstanding, end of year
788,748

 
$
20.89

 
1,327,066

 
$
18.72

 
1,924,133

 
$
21.16

Exercisable at end of year
574,439

 
$
21.76

 
914,743

 
$
21.12

 
1,434,544

 
$
24.59

 
 
 
 
 
 
 
 
 
 
 
 
 
For the Year Ended December 31,
 
2012
 
2011
 
2010
 
Non-vested
Restricted
Stock
 
Weighted-
Average
Grant Date
Fair Value
 
Non-vested
Restricted
Stock
 
Weighted-
Average
Grant Date
Fair Value
 
Non-vested
Restricted
Stock
 
Weighted-
Average
Grant Date
Fair Value
Outstanding, beginning of year
196,076

 
$
12.15

 
182,609

 
$
9.63

 
200,548

 
$
5.93

Granted
72,637

 
21.92

 
73,060

 
18.77

 
115,807

 
12.21

Canceled
(59,624
)
 
16.98

 
(2,003
)
 
18.77

 
(11,599
)
 
8.15

Vested and issued
(117,778
)
 
10.62

 
(57,590
)
 
12.33

 
(122,147
)
 
6.14

Outstanding, end of year
91,311

 
$
18.75

 
196,076

 
$
12.15

 
182,609

 
$
9.63