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Stock-Based Compensation Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
The Company recorded stock-based compensation in general and administrative expenses in the accompanying Consolidated Statements of Operations, the components of which are further described below for the years ended December 31, 2011, 2010, and 2009 (in thousands): 
 
 
2011
 
2010
 
2009
Restricted stock
$
10,659

 
7,236

 
5,227

Directors' fees paid in common stock
 
269

 
231

 
279

Less: Amount capitalized
 
(1,104
)
 
(852
)
 
(1,574
)
Total
$
9,824

 
6,615

 
3,932

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
The following table reports stock option activity during the year ended December 31, 2011: 
 
Number of
Options
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Term
(in years)
 
Aggregate
Intrinsic
Value
(in thousands)
Outstanding December 31, 2010
442,880

$
51.85

 
3.5

$
(4,255
)
Less: Exercised
12,561

 
35.61

 
 
 
 
Less: Forfeited
26,754

 
51.43

 
 
 
 
Less: Expired
17,416

 
58.28

 
 
 
 
Outstanding December 31, 2011
386,149

$
52.12

 
3.0

$
(5,598
)
Vested and expected to vest - December 31, 2011
386,149

$
52.12

 
3.0

$
(5,598
)
Exercisable December 31, 2011
386,149

$
52.12

 
3.0

$
(5,598
)
Schedule of Nonvested Option Activity [Table Text Block]
The following table presents information regarding non-vested option activity during the year ended December 31, 2011: 
 
Non-vested
Number of
Options
 
Weighted
Average
Grant-Date
Fair Value
Non-vested at December 31, 2010
2,185

$
8.78

Less: 2011 Vesting
2,185

 
8.78

Non-vested at December 31, 2011

$

Schedule of Nonvested Share Activity [Table Text Block]
The following table reports non-vested restricted stock activity during the year ended December 31, 2011: 
 
Number of
Shares
 
Intrinsic
Value
(in thousands)
 
Weighted
Average
Grant
Price
Non-vested at December 31, 2010
436,559

 
 
 
 
Add: Time-based awards granted
128,139

 
 
$
42.19
Add: Performance-based awards granted
18,246

 
 
$
41.54
Add: Market-based awards granted
165,689

 
 
$
41.54
Less: Vested and Distributed
173,513

 
 
$
43.06
Less: Forfeited
12,861

 
 
$
40.31
Non-vested at December 31, 2011
562,259

$
21,152