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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2012
Stock-Based Compensation [Abstract]  
Schedule of compensation cost for share-based payment arrangements, allocation of share-based compensation costs by plan table
Net stock-based compensation expense recognized in the accompanying consolidated statements of income and comprehensive income was as follows:
 
Years Ended December 31,
 
2012
 
2011
 
2010
Stock-based compensation expense related to:
(in thousands)
Nonqualified stock options
$
1,958

 
$
1,648

 
$
2,039

RSUs
2,435

 
2,094

 
2,014

PSUs
1,748

 

 

Total
6,141

 
3,742

 
4,053

Less: related tax benefit
1,972

 
1,220

 
1,116

Net stock-based compensation expense
$
4,169

 
$
2,522

 
$
2,937

Schedule of share-based payment award, stock options, valuation assumptions table
The fair value of the stock options granted during the years ended December 31, 2012, 2011, and 2010 were calculated using the following weighted average assumptions:
 
2012

2011

2010
Expected volatility
42.7
%
 
43.6
%
 
47.3
%
Expected life (in years)
4.8

 
4.8

 
4.8

Dividend yield
1.4
%
 
1.2
%
 
1.6
%
Risk-free interest rate
1.1
%
 
1.9
%
 
2.6
%
Weighted average grant date fair values of options granted
$5.64
 
$7.01
 
$5.80
Schedule of share-based compensation arrangement by share-based payment award, options, vested and expected to vest, outstanding table
Changes in outstanding stock options for the year ended December 31, 2012 were as follows:
 
Number of Options
 
Weighted-Average Exercise Price
 
Weighted Average Remaining Contractual Life
Options outstanding at December 31, 2009
1,512,706

 
$
16.30

 
5.4 years
Granted
406,020

 
15.31

 
6.2 years
Exercised
(7,783
)
 
12.03

 
 
Expired
(35,441
)
 
17.94

 

Forfeited
(112,399
)
 
15.03

 

Options outstanding at December 31, 2010
1,763,103

 
16.14

 
4.8 years
Granted
355,063

 
19.81

 
6.2 years
Exercised
(92,646
)
 
16.53

 

Expired
(49,445
)
 
17.32

 

Forfeited
(187,369
)
 
15.36

 

Options outstanding at December 31, 2011
1,788,706

 
16.90

 
4.3 years
Granted
242,300

 
17.02

 
6.2 years
Exercised
(101,261
)
 
14.13

 

Expired
(98,973
)
 
18.78

 

Options outstanding at December 31, 2012
1,830,772

 
16.97

 
3.7 years
Exercisable at December 31, 2012
1,086,306

 
16.97

 
2.8 years
Schedule of fair value of options vested and instrinsic value of outstanding and exercisable options table
The fair value of options vested and the intrinsic value of outstanding and exercisable options as of December 31, were as follows:
 
2012
 
2011
 
2010
 
(in thousands)
Fair value of options vested
$
1,948

 
$
1,929

 
$
2,041

Intrinsic value of outstanding options
6,616

 
3,332

 
3,561

Intrinsic value of exercisable options
3,918

 
1,508

 
750

Schedule of share-based compensation, restricted stock and restricted stock units activity
Changes in outstanding RSUs for the year ended December 31, 2012 were as follows:
 
 
Number of RSUs
 
Weighted Average Grant Date Fair Value
RSUs outstanding at December 31, 2009
 
365,343

 
$
14.66

Granted
 
195,301

 
15.36

Forfeited
 
(38,837
)
 
14.81

Vested
 
(93,292
)
 
14.60

RSUs outstanding at December 31, 2010
 
428,515

 
14.98

Granted
 
157,570

 
19.03

Forfeited
 
(62,618
)
 
15.29

Vested
 
(105,278
)
 
15.25

RSUs outstanding at December 31, 2011
 
418,189

 
16.39

Granted
 
117,065

 
16.95

Vested
 
(128,992
)
 
16.36

RSUs outstanding at December 31, 2012
 
406,262

 
16.56

Vested but unsettled RSUs at December 31, 2012
 
106,510

 
15.30

Schedule of fair value of RSUs vested and instrinsic value of outstanding and vested RSUs table
The fair value of RSUs vested and the intrinsic value of outstanding and vested RSUs as of December 31, were as follows:
 
2012
 
2011
 
2010
 
(in thousands)
Fair value of RSUs vested
$
2,110

 
$
1,605

 
$
1,362

Intrinsic value of outstanding RSUs
8,361

 
7,565

 
7,490

Intrinsic value of vested RSUs
2,655

 
1,904

 
1,631

PSUs awarded to certain officers table
The Company awarded PSUs to certain officers of the Company as follows:
 
Target Number Awarded
 
Fair Value on Date of Grant
 
Aggregate Fair Value on Date of Grant
March 2012
 
 
 
 
(in thousands)
PSUs(1)
158,900

 
17.02

 
$
2,704

(1)
The PSUs have a performance period of three years and are subject to certain performance goals, based on the Company's statutory combined ratio, with payouts that range from 0% to 200% of the target awards.