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Equity Incentive Compensation Plans and Other Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of stock options or units activity
 
Number of
Shares
 
Weighted
Average
Exercise
Price
 
Aggregate
Intrinsic Value
(in thousands)(1)
 
Number of
Shares
Exercisable
Outstanding at January 1, 2009
2,421,650

 
$
25.16

 
$
—

 
1,842,532

Granted
—

 
—

 
 

 
 

Exercised
(62,050
)
 
13.52

 
560

 
 

Cancelled/expired
(83,580
)
 
28.48

 
 

 
 

Outstanding as of December 31, 2009
2,276,020

 
25.36

 
15,296

 
2,008,325

Granted
—

 
—

 
 

 
 

Exercised
(227,100
)
 
19.40

 
3,570

 
 

Cancelled/expired
(31,695
)
 
35.51

 
 

 
 

Outstanding at December 31, 2010
2,017,225

 
25.87

 
35,974

 
1,884,937

Granted
89,865

 
48.50

 
 

 
 

Exercised
(579,635
)
 
17.47

 
17,746

 
 

Cancelled/expired
(6,765
)
 
45.92

 
 

 
 

Outstanding at December 31, 2011
1,520,690

 
$
30.32

 
$
17,798

 
1,434,020

_________________________________________
(1)
The intrinsic value of a stock option is the amount by which the market value of the underlying stock at the end of the related period exceeds the exercise price of the option.
Summary of assumptions to estimate fair value of stock options
 
2011
Expected volatility
45.00
%
Risk-free rate
2.54
%
Dividend yield
0.62
%
Expected term (in years)
6.0
Schedule of Range of Exercise Prices
 
 
Stock Options Outstanding
 
Stock Options Exercisable
Range of Exercise Prices
 
Number of
Options
 
Weighted
Average
Remaining
Contractual
Life (Years)
 
Weighed
Average
Exercise
Price
 
Aggregate
Intrinsic
Value
(in thousands)
 
Number
of Options
 
Weighted
Average
Remaining
Contractual
Life (Years)
 
Weighed
Average
Exercise
Price
 
Aggregate
Intrinsic
Value
(in thousands)
$7.00-$15.00
 
199,000

 
2.13

 
$
12.36

 
5,902

 
199,000

 
2.13

 
$
12.36

 
$
5,902

$15.01-$25.00
 
287,000

 
2.90

 
21.60

 
5,861

 
287,000

 
2.90

 
21.60

 
5,861

$25.01-$35.00
 
655,001

 
4.51

 
31.65

 
6,792

 
655,001

 
4.51

 
31.65

 
6,792

$35.01-$48.50
 
379,689

 
6.79

 
44.01

 
—

 
293,019

 
6.09

 
42.68

 
—


 
1,520,690

 
4.47

 
$
30.32

 
17,798

 
1,434,020

 
4.18

 
$
29.22

 
$
18,360
Summary of restricted stock units activity
 
RSUs
 
Weighted Average
Intrinsic Value at
Grant Date
 
Vest Date Fair
Value
(in thousands)
Outstanding at January 1, 2009
966,198

 
$
20.83

 
 

Granted
294,504

 
26.72

 
 

Issued
(107,375
)
 
28.98

 
$
2,574

Canceled/expired
(46,034
)
 
25.08

 
 

Outstanding at December 31, 2009(1)(2)
1,107,293

 
$
22.14

 
 

Granted
34,529

 
30.94

 
 

Issued
(246,633
)
 
28.98

 
$
7,813

Canceled/expired
(37,829
)
 
22.20

 
 

Outstanding at December 31, 2010(1)(2)
857,360

 
$
19.67

 
 

Granted
159,333

 
47.98

 
 

Issued
(62,127
)
 
26.18

 
$
2,588

Canceled/expired
(39,544
)
 
25.12

 
 

Outstanding at December 31, 2011(1)(2)
915,022

 
$
23.88

 
 

__________________________________
(1)
The balance outstanding includes RSUs granted to the non-employee directors that 100% vested at date of grant but are subject to a deferral election before the corresponding shares of Common Stock are issued. For the years ended December 31, 2011, 2010 and 2009, 30,544, 10,522 and 10,522 RSUs have vested, but the corresponding shares of Common Stock have not been issued.
(2)
The balance outstanding includes RSUs granted to executive officers and other officers that have vested in accordance with the RSU agreement, but are subject to a deferral election before the corresponding shares of Common Stock are issued. For the years ended December 31, 2011, 2010 and 2009, 483,908, 289,335, and 124,799 RSUs have vested, but the corresponding shares of Common Stock have not been issued.
Summary of performance share awards activity
 
Performance Share Awards
 
Weighted Average
Grant Date
Fair Value
 
Vest Date Fair
Value
(in thousands)
Outstanding at January 1, 2009
—

 
$
—

 
 

Granted
—

 
—

 
 

Issued
—

 
—

 
$
—

Canceled/expired
—

 
—

 
 

Outstanding at December 31, 2009
—

 
$
—

 
 

Granted
103,794

 
31.20

 
 

Issued
—

 
—

 
$
—

Canceled/expired
—

 
—

 
 

Outstanding at December 31, 2010
103,794

 
$
31.20

 
 

Granted
65,620

 
51.86

 
 

Issued
—

 
—

 
$
—

Canceled/expired
(6,565
)
 
44.20

 
 

Outstanding at December 31, 2011
162,849

 
$
39.00

 
 
Summary of assumptions used in valuing market-based restricted shares
 
2011
 
2010
Number of simulations
100,000

 
100,000

Expected volatility
44
%
 
79
%
Risk-free rate
1.15
%
 
1.36
%