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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2011
STOCK-BASED COMPENSATION [Abstract]  
Schedule of Share-based Payment Award, Restricted Stock Units, Valuation Assumptions
The following are the key assumptions used in this valuation:
 
 
2011
 
2010
Risk Free Interest Rate:
1.18
%
 
0.72
%
Expected Stock Price Volatility:
49.2
%
 
50.4
%
Expected Service Period:
2.7 years

 
3.0 years

Expected Dividend Yield (assuming full reinvestment):
—
%
 
—
%
Summary of Option Activity
A summary of the option activity is presented in the following table (dollars in thousands, except per share amounts):
 
 
Range of Per Share Exercise Price  
 
Shares Under Options
 
Weighted Average Exercise Price Per Share
 
Weighted Average Remaining Contractual Term (Years)
 
Aggregate Intrinsic Value
Outstanding as of December 31, 2010
 
$11.99 - 21.83
 
450,067

 
$
17.65

 
3.91
 
$
3,888

Granted
 
—
 
—

 
—

 
 
 
 
Exercised
 
11.99
 
(45,657
)
 
11.99

 
 
 
 
Forfeited
 
—
 
—

 
—

 
 
 
 
 
 
 
 
 
 
 

 
 
 
 

Outstanding as of December 31, 2011
 
$12.34 - 21.83
 
404,410

 
$
18.29

 
3.30
 
$
3,530

 
 
 
 
 
 
 

 
 
 
 

Exercisable as of December 31, 2011
 
$12.34 - 21.83
 
268,695

 
$
18.33

 
2.71
 
$
2,403

 
 
 
 
 
 
 
 
 
 
 
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
The following table summarizes additional information concerning restricted stock units at December 31, 2011 (dollars in thousands, except per share amounts):
Restricted Stock Units 
Unvested Units as of
December 31, 2010
Granted
Vested
Unvested Units as of
December 31, 2011
 
Aggregate Intrinsic Value of Unvested Units
 
Weighted Average Remaining Vesting Period as of December 31, 2011 (Months)
Time-Based Units
97,643

928

—

98,571

 
$
1,700

 
46.5

FFO Units
97,639

927

—

98,566

 
1,700

 
36.0

TSR Units
97,642

927

—

98,569

 
1,635

 
36.0

Carry-Over Units
74,717

—

(31,144
)
43,573

 
771

 
19.3

Make-Whole Units
86,878

—

(21,719
)
65,159

 
1,124

 
34.5

Initial Board Award
8,752

—

(4,368
)
4,384

 
80

 
11.4

Annual Board Award
5,104

9,612

(9,904
)
4,812

 
80

 
5.4

 
468,375

12,394

(67,135
)
413,634

 
$
7,090

 
35.9

 
 
 
 
 
 
 
 
 
Weighted Average Grant Date Fair Value Per Unit
$
17.32

$
16.74

$
18.36

$
17.14