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Common Stock (Tables)
 6 Months Ended
Jun. 30, 2012
Stockholders' Equity Note [Abstract]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]
The following table provides a summary of the impact of our outstanding stock-based compensation plans on the results of operations for the periods presented:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2012
 
2011 (1)
 
2012
 
2011 (1)
 
 
(in thousands)
 
 
 
 
 
 
 
 
 
Total stock-based compensation expense
 
$
1,955

 
$
4,004

 
$
3,901

 
$
5,549

Income tax benefit
 
(744
)
 
(1,521
)
 
(1,486
)
 
(2,108
)
Net expense
 
$
1,211

 
$
2,483

 
$
2,415

 
$
3,441

 
 
 
 
 
 
 
 
 
__________
(1) Includes a total of $2.5 million, pretax, related to a separation agreement with our former chief executive officer.
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
In January 2012, the Committee awarded a total of 30,541 market-based restricted shares to our executive officers. In addition to continuous employment, the vesting of these shares is contingent on the Company's total shareholder return ("TSR"), which is essentially the Company’s stock price change including any dividends, as compared to the TSR of a set group of 15 peer companies. The shares are measured over a three-year period ending on December 31, 2014, and can result in a payout between zero and 200% of the total shares awarded. The weighted-average grant date fair value per market-based share for these awards granted was computed using the Monte Carlo pricing model using the following assumptions:

    
 
 
Six Months Ended June 30,
 
 
2012
 
2011
 
 
 
 
 
Expected term
 
3 years

 
3 years

Risk-free interest rate
 
0.3
%
 
1.1
%
Expected volatility
 
65.3
%
 
74.2
%
Weighted-average grant date fair value per share
 
$
36.54

 
$
58.53

In January 2012, the Compensation Committee of our Board of Directors (the "Committee") awarded 68,361 SARs to our executive officers. The fair value of each SAR award was estimated on the date of grant using a Black-Scholes pricing model using the following assumptions:

 
Six Months Ended June 30,
 
2012
 
2011
 
 
 
 
Expected term
6 years

 
6 years

Risk-free interest rate
1.1
%
 
2.5
%
Expected volatility
64.3
%
 
60.2
%
Weighted-average grant date fair value per share
$
17.61

 
$
25.22
Schedule of Share-based Compensation, Stock Appreciation Rights Award Activity [Table Text Block]
The following table presents the changes in our SARs:
 
 
Six Months Ended June 30,
 
 
2012
 
2011
 
 
Number
of
SARs
 
Weighted -Average
Exercise
Price
 
Average Remaining Contractual
Term
(in years)
 
Aggregate Intrinsic
Value
(in thousands)
 
Number
of
SARs
 
Weighted -Average
Exercise
Price
 
Average Remaining Contractual
Term
(in years)
 
Aggregate Intrinsic
Value
(in thousands)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Outstanding beginning of year, January 1,
 
50,471

 
$
31.61

 
8.6
 
$
341

 
57,282

 
$
24.44

 
9.3
 
$
1,020

Granted
 
68,361

 
30.19

 
9.5
 
—

 
31,552

 
43.95

 
9.7
 
—

Outstanding at June 30,
 
118,832

 
30.80

 
8.9
 
3

 
88,834

 
31.37

 
5.3
 
313

Vested and expected to vest at June 30,
 
112,285

 
30.76

 
8.9
 
3

 
84,851

 
31.27

 
5.0
 
302

Exercisable at June 30,
 
27,458

 
28.84

 
8.0
 
2

 
48,999

 
29.61

 
2.1
 
197

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
The following table presents the changes in nonvested time-based awards for the six months ended 2012:
 
 
Shares
 
Weighted-Average
Grant-Date
Fair Value per Share
 
 
 
 
 
Nonvested at December 31, 2011
 
527,801

 
$
29.29

Granted
 
129,643

 
29.58

Vested
 
(131,015
)
 
30.20

Forfeited
 
(12,498
)
 
27.76

Nonvested at June 30, 2012
 
513,931

 
29.23

 
 
 
 
 

 
As of / Six Months Ended June 30,
 
2012
 
2011
 
(in thousands, except per share data)
 
 
 
 
Total intrinsic value of time-based awards vested
$
4,315

 
$
7,185

Total intrinsic value of time-based awards nonvested
12,602

 
14,293

Market price per common share as of June 30,
24.52

 
29.91

Weighted-average grant date fair value per share
29.58

 
37.42
Schedule of Nonvested Performance-based Units Activity [Table Text Block]
The following table presents the change in nonvested market-based awards for the six months ended 2012:

 
Shares
 
Weighted-Average
Grant-Date
Fair Value per Share
 
 
 
 
Nonvested at December 31, 2011
43,081

 
$
42.05

Granted
30,541

 
36.54

Nonvested at June 30, 2012
73,622

 
41.87