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Share-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
For the year ended December 31, 2011, we awarded 461,458 RSUs with an estimated value of $7.8 million. The RSU awards will vest ratably over three years.

(in thousands, except weighted average fair value prices)
Number of Shares
 
Weighted Average Grant-Date Fair Value
Unvested RSUs outstanding at December 31, 2010
1,194

 
$
18.29

RSUs granted
461

 
$
16.97

RSUs vested
(331
)
 
$
18.76

RSUs forfeited
(131
)
 
$
16.86

Unvested RSUs outstanding at December 31, 2011
1,193

 
$
17.74
Schedule of Other Share-based Compensation, Activity [Table Text Block]
PBRSU activity for the year ended December 31, 2011, is as follows:

(in thousands, except weighted average fair value prices)
Number of Shares
 
Weighted Average Grant-Date Fair Value
Unvested PBRSUs outstanding at December 31, 2010
364

 
$
18.76

PBRSUs granted
228

 
$
16.32

PBRSUs assumed from acquisitions
507

 
$
17.76

PBRSUs forfeited
(111
)
 
$
18.47

Unvested PBRSUs outstanding at December 31, 2011
988

 
$
17.71
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The fair values of these stock options were estimated using a Black-Scholes model with the following weighted-average assumptions:
    
 
2011
 
2010
Expected dividend yield
0
%
 
0
%
Risk-free interest rate (1)
1.84
%
 
2.58
%
Expected volatility (2)
33.19
%
 
34.59
%
Expected life (3)
5.5

 
6.5

(1)
The risk-free interest rate for the periods within the contractual term of the options is based on the U.S. Treasury yield curve in effect at the time of the grant.
(2)
The expected volatility is a measure of the amount by which a stock price has fluctuated or is expected to fluctuate based primarily on our and our peers' historical data.
(3)
The expected life is the period of time, on average, that participants are expected to hold their options before exercise based primarily on our historical data.
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
Option activity for the year ended December 31, 2011, is as follows:

(in thousands, except weighted average prices)
Number of Shares
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Term
 
Aggregate Intrinsic Value
Options outstanding at December 31, 2010
5,129

 
$
21.27

 
 
 
 
Options granted
684

 
$
16.32

 
 
 
 
Options exercised
(221
)
 
$
15.32

 
 
 
 
Options canceled
(991
)
 
$
21.45

 
 
 
 
Options outstanding at December 31, 2011
4,601

 
$
20.78

 
2.4

 
$
484

Options vested and expected to vest at December 31, 2011
4,580

 
$
20.80

 
4.8

 
$
248

Options exercisable at December 31, 2011
3,060

 
$
22.35

 
2.8

 
$
49
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]
The following table sets forth the share-based compensation expense recognized, excluding discontinued operations, for the years ended December 31, 2011, 2010 and 2009.

(in thousands)
2011
 
2010
 
2009
Restricted stock
$
7,141

 
$
9,979

 
$
19,476

Performance based restricted stock
1,779

 
2,098

 
—

Stock options
2,430

 
1,469

 
5,212

Employee stock purchase plan
299

 
423

 
949

 
$
11,649

 
$
13,969

 
$
25,637