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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of stock option activity
A summary of our stock option activity for 2014 and 2013 is as follows (in thousands, except weighted-average exercise price and weighted-average remaining contractual term):

 
 
Stock
Options
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Term
(Years)
 
Aggregate
Intrinsic
Value
Outstanding at December 31, 2012
 
2,181

 
$
17.20

 
 
 
 
Granted
 
—

 
$
—

 
 
 
 
Exercised
 
(1,043
)
 
$
16.73

 
 
 
 
Expired
 
(36
)
 
$
30.70

 
 
 
 
Forfeited/Canceled
 
(71
)
 
$
16.06

 
 
 
 
Outstanding at December 31, 2013
 
1,031

 
$
17.28

 
3.7
 
$
14,516

Granted
 
—

 
$
—

 
 
 
 
Exercised
 
(177
)
 
$
16.12

 
 
 
 
Expired
 
—

 
$
—

 
 
 
 
Forfeited/Canceled
 
(9
)
 
$
15.98

 
 
 
 
Outstanding at December 31, 2014
 
845

 
$
17.54

 
2.7
 
$
26,400

Exercisable at December 31, 2014
 
414

 
$
17.51

 
2.7
 
$
12,952

Vested and expected to vest at December 31, 2014
 
836

 
$
17.56

 
2.7
 
$
26,105
Summary of options outstanding
The following table summarizes information about the options outstanding at December 31, 2014 (in thousands, except per share amounts and the weighted-average remaining contractual life):

Options Outstanding
 
Options Exercisable
Exercise Price
 
Outstanding 
 
Weighted-Avg.
Remaining
Contractual
        Life        
 
Weighted-Avg.
Exercise Price
 
Exercisable
 
Weighted-Avg.
Exercise Price
$15.98 - $18.94
 
845,285
 
2.7
 
$17.54
 
414,308
 
$17.51
Assumptions used to determine fair value of options granted
The following weighted-average assumptions were used to determine the fair value of those options granted in 2012:

 
For Year Ended
 
December 31,
 
2012
Expected volatility(1)
34.1%
Expected dividends
—%
Expected term(2)
4.4 years
Risk-free rate(3)
0.62%

____________________________ 
(1) 
We estimated the volatility of our common stock on the date of grant based on both historical and implied volatility.

(2) 
The expected term represents the period of time that we expect options to be outstanding. We estimated the expected term based upon the weighted-average of our historical experience.

(3) 
The risk-free interest rate is based on the implied yield in effect at the time of option grant on U.S. Treasury zero-coupon issues with equivalent remaining terms.
Summary of nonvested stock activity
A summary of our non-vested stock activity for 2014 and 2013 is as follows (in thousands, except weighted-average fair value per share):
 
 
Shares
 
Grant Date
Weighted-
Average Fair
Value Per Share
Outstanding at December 31, 2012
 
1,451

 
$
19.90

Granted
 
211

 
$
29.77

Vested
 
(477
)
 
$
20.18

Forfeited/Canceled
 
(2
)
 
$
18.78

Outstanding at December 31, 2013
 
1,183

 
$
21.56

Granted
 
172

 
$
40.21

Vested
 
(512
)
 
$
21.03

Forfeited/Canceled
 
(21
)
 
$
22.40

Outstanding at December 31, 2014
 
822

 
$
25.77
Schedule of Unvested Restricted Stock Units Roll Forward [Table Text Block]
A summary of our RSU award activities for 2014 and 2013 is as follows (in thousands, except weighted-average fair value per share):

 
 
Units
 
Grant Date
Weighted-
Average Fair
Value Per Unit
Outstanding at December 31, 2012
 
308

 
$
18.94

Granted
 
292

 
$
27.78

Vested/Paid out
 
(38
)
 
$
18.94

Forfeited/Canceled
 
—

 
$
—

Outstanding at December 31, 2013
 
562

 
$
23.54

Granted
 
253

 
$
39.05

Vested/Paid out
 
(192
)
 
$
21.04

Performance Share Units Adjustment (1)
 
62

 
$
18.94

Forfeited/Canceled
 
—

 
$
—

Outstanding at December 31, 2014
 
685

 
$
29.60
Summary of Restricted Stock Units (RSUs) activity
A summary of our RSU award activities for 2014 and 2013 is as follows (in thousands, except weighted-average fair value per share):

 
 
Units
 
Grant Date
Weighted-
Average Fair
Value Per Unit
Outstanding at December 31, 2012
 
308

 
$
18.94

Granted
 
292

 
$
27.78

Vested/Paid out
 
(38
)
 
$
18.94

Forfeited/Canceled
 
—

 
$
—

Outstanding at December 31, 2013
 
562

 
$
23.54

Granted
 
253

 
$
39.05

Vested/Paid out
 
(192
)
 
$
21.04

Performance Share Units Adjustment (1)
 
62

 
$
18.94

Forfeited/Canceled
 
—

 
$
—

Outstanding at December 31, 2014
 
685

 
$
29.60