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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock option activity
The following table summarizes the stock option activity during the year ended December 31, 2013 for all grants under the Equity Compensation Plan:
 
 
Options
 
Weighted
Average
Exercise
Price
Outstanding at January 1, 2013
 
828,230

 
$
11.58

Granted
 
—

 
—

Exercised
 
(252,081
)
 
14.22

Forfeited
 
—

 
—

Cancelled
 
(5,666
)
 
7.39

Outstanding at December 31, 2013
 
570,483

 
10.43

Vested and expected to vest
 
570,483

 
10.43

Exercisable at December 31, 2013
 
570,483

 
$
10.43
Summary of stock options outstanding and exercisable by price range
A summary of stock options outstanding and exercisable by price range at December 31, 2013 is as follows (in thousands, except share and per share data):
 
 
Outstanding and Exercisable
 
 
Number of
Options
Outstanding
at December 31,
 
Weighted
Average
Remaining
Contractual
 
Weighted
Average
Exercise
 
Aggregate
Intrinsic
Exercise Price
 
2013
 
Life (Years)
 
Price
 
Value (A)
$5.91-$9.04
 
197,430
 
1.0
 
$
8.15

 
$
5,176

$9.43-$14.16
 
294,936
 
2.00
 
$
10.55

 
$
7,023

$14.39-$18.34
 
78,117
 
1.40
 
$
15.77

 
$
1,452

Total
 
570,483
 
1.60
 
$
10.43

 
$
13,651


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(A) The difference between the stock option’s exercise price and the closing price of the common stock at December 31, 2013.
Restricted stock and units activity
The following table summarizes the stock activity related to restricted stock awards and units and fully vested share based payment awards:
 
 
Number of
Shares
 
Weighted-
Average
Grant-Date
Fair Value
Unvested, January 1, 2013
 
620,971

 
$
24.00

Granted
 
168,182

 
32.76

Vested
 
(261,257
)
 
23.46

Forfeited
 
(1,300
)
 
27.70

Unvested, December 31, 2013
 
526,596

 
$
27.05
Schedule of Nonvested Performance-based Units Activity [Table Text Block]
The following table summarizes the activity related to performance unit awards:
 
 
Number of
Shares
 
Weighted-
Average
Grant-Date
Fair Value
Unvested, January 1, 2013
 
—

 
$
—

Granted
 
35,776

 
47.78

Vested
 
—

 
—

Cancelled
 
—

 
—

Unvested, December 31, 2013
 
35,776

 
$
47.78
Assumptions used in determining the fair value of stock appreciation rights
The following table provides the assumptions used in determining the fair value of the SARs at December 31, 2011:
Dividend yield rate
 
—

Expected volatility
 
23.4
%
Risk-free interest rates
 
0.02
%
Expected life
 
0.02 years