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Equity-based Incentive Plans (Tables)
12 Months Ended
Dec. 31, 2012
Equity-based Incentive Plans  
Summary of the company's RSU activity and outstanding RSU's

 A summary of the company's RSU activity during 2012 and outstanding RSU's as of December 31, 2012 are presented below (dollars in thousands except grant date fair value):

 
  Number of
RSU's
  Weighted Average
Grant
Date Fair Value
  Aggregate Intrinsic
Value
  Unrecognized
Compensation
 

Outstanding RSU's as of January 1, 2012

      $              

RSU's granted

    1,422,448     11.95              

RSU's vested

    (143,666 )   12.65              

RSU's forfeited

    (9,475 )   11.92              
                         

Outstanding RSU's as of December 31, 2012 (nonvested)

    1,269,307   $ 11.87   $ 17,428   $ 12,318  
                         
Schedule of stock option activity for all plans

 

  Number of
Options
  Weighted Average
Exercise Price
  Weighted Average
Fair Value
 

Outstanding options as of January 1, 2010

    6,489,371   $ 13.69   $ 5.09  

Granted

    2,545,932     14.73     5.81  

Exercised

    (1,414,153 )   8.11     2.89  

Forfeited

    (214,757 )   20.35     6.33  
                   

As of December 31, 2010

    7,406,393     14.91     5.14  

Granted

    2,742,904     14.34     5.36  

Exercised

    (1,047,297 )   11.37     4.28  

Forfeited

    (499,718 )   16.61     6.15  
                   

As of December 31, 2011

    8,602,282     15.06     5.25  

Granted

             

Exercised

    (451,135 )   6.70     2.67  

Forfeited

    (1,077,438 )   21.85     6.04  
                   

As of December 31, 2012

    7,073,709     14.56     5.30  
                   
Schedule of information concerning outstanding options, by range of exercise price

 

Range of
Exercise Price
  Exercisable
Outstanding
Options
  Weighted Average
Remaining
Contractual Life
(Years)
  Weighted Average Exercise
Price of Exercisable
Outstanding
Options
 

$5 to $10

    1,153,760     0.9   $ 5.23  

$10 to $15

    2,869,366     2.9     13.14  

$15 to $20

    2,617,981     2.8     16.39  

$35 to $40

    432,602     0.4     37.84  
Schedule of valuation assumptions used in determining the fair value of stock options

 

  2011   2010  

Volatility(1)

    65.1 - 66.3 %   66.4 - 67.0 %

Risk-free interest rate(2)

    0.4 - 1.4 %   0.8 - 2.0 %

Dividend yield(3)

    2.3 - 2.5 %   2.0 - 2.2 %

Expected life (years)(4)

    2.8 - 4.1     2.8 - 4.1  
(1)
The volatility is based on the historical volatility of the company's stock.

(2)
The risk-free interest rate is based on the U.S. Treasury strip rate for the expected life of the option.

(3)
The expected dividend yield is based on the company's latest annualized dividend rate and recent historical market prices of the underlying common stock at the date of grant.

(4)
The expected life in years is determined primarily from historical stock option exercise data.