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SHARE-BASED COMPENSATION - (Tables)
 12 Months Ended
Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity
The following table summarizes the Company's common stock option transactions for the three years ended December 31, 2013.
 
 
 
Number of
Shares
 
Weighted Average
Exercise Price
 
Weighted Average Remaining Contractual Term
(in years)
 
Aggregate Intrinsic Value
(in millions)
 
Outstanding, December 31, 2010
 
780,981

 
$
18.10

 
 
 
 
 
Granted
 
210,000

 
26.82

 
 
 
 
 
Exercised
 
(28,928
)
 
17.50

 
 
 
$
0.7

 
Forfeited
 
(244,937
)
 
17.50

 
 
 
 
 
Canceled
 
(2,250
)
 
17.50

 
 
 
 
 
Outstanding, December 31, 2011
 
714,866

 
$
20.89

 
 
 
 
 
Granted
 
116,119

 
42.69

 
 
 
 
 
Exercised
 
(143,652
)
 
17.50

 
 
 
$
6.4

 
Forfeited
 
(27,000
)
 
17.50

 
 
 
 
 
Outstanding, December 31, 2012
 
660,333

 
$
25.60

 
 
 
 
 
Granted
 
85,930

 
72.42

 
 
 
 
 
Exercised
 
(74,430
)
 
20.62

 
 
 
$
3.7

 
Forfeited
 
(41,153
)
 
29.61

 
 
 
 
 
Outstanding, December 31, 2013
 
630,680

 
$
32.31

 
7.5
 
 
 
 
 
 
 
 
 
 
 
 
 
Options vested and exercisable as of December 31, 2013
 
275,011

 
$
24.93

 
7.1
 
$
13.7

(1) 
 
 
 
 
 
 
 
 
 
 
Remaining options expected to vest as of December 31, 2013
 
332,718

 
$
37.98

 
8.1
 
$
12.2

(1) 
 
(1)
The aggregate intrinsic value of options represents the total pre-tax intrinsic value (the difference between the estimated fair value of the Company's stock on December 31, 2013 and the exercise price, multiplied by the number of in-the-money options) that would have been received by the option holders had all option holders exercised their options on December 31, 2013. This amount changes based upon the fair market value of the Company's common stock.
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The estimated fair value of the options granted was measured on the date of grant using the Black-Scholes option pricing model with the following weighted average assumptions:
 
 
 
December 31,
 
 
2013
 
2012
 
2011
Risk-Free Interest Rate
 
0.77%
 
1.16%
 
1.37%
Expected Term
 
6 years
 
6.6 years
 
6.50 years
Expected Volatility
 
40.0%
 
40.0%
 
40.7%
Expected Dividend Yield
 
—%
 
—%
 
—%
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
The following table summarizes the Company's restricted stock activity for the years ended December 31:

 
 
Time-Based
 
Performance-Based
 
 
Number of
Shares
 
Weighted Average
Grant Date
Fair Value
 
Number of
Shares
 
Weighted Average
Grant Date
Fair Value
 
 
 
 
 
 
 
 
 
Unvested, December 31, 2010
 
—

 
$
—

 
526,220

 
$
11.29

Granted
 
105,616

 
29.04

 
—

 
—

Vested
 
—

 
—

 
(500
)
 
10.85

Forfeited / Canceled
 
(5,000
)
 
35.98

 
(259,484
)
 
11.29

Unvested, December 31, 2011
 
100,616

 
$
28.70

 
266,236

 
$
11.29

Granted
 
55,870

 
42.08

 
184,192

 
52.71

Vested
 
(26,865
)
 
29.33

 
(47,120
)
 
29.20

Forfeited / Canceled
 
(1,342
)
 
37.32

 
(30,809
)
 
14.93

Unvested, December 31, 2012
 
128,279

 
$
34.30

 
372,499

 
$
29.20

Granted
 
51,465

 
72.45

 
98,018

 
72.46

Vested
 
(43,514
)
 
35.68

 
(121,794
)
 
40.75

Forfeited / Canceled
 
(16,911
)
 
46.64

 
(133,007
)
 
43.89

Unvested, December 31, 2013
 
119,319

 
$
48.50

 
215,716

 
$
60.76