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Stockholders' Equity and Partners' Capital (Tables)
 12 Months Ended
Dec. 31, 2013
Class of Stock  
Schedule of Assumptions Used

. With the assistance of our independent valuation specialists, we utilized a Monte Carlo simulation to calculate the 2012 weighted average grant date fair value of $6.25 per unit using the following assumptions:
Volatility
21.25% - 22.64%

Dividend yield
5.80
%
Expected term in years
0.61 - 0.82

Risk-free rate
0.436% - 0.576%

Stock price (per share)
$9.92 - $9.97
LTIP
  
Class of Stock  
Schedule of Nonvested Share Activity
The following is a summary of the activity in our LTIP units during 2013:
 
LTIP Units
 
Weighted
Average Grant
Date Fair Value
Balance as of December 31, 2012
2,900,000

 
$
6.25

Granted
—

 
—

Vested
(2,380,700
)
 
5.56

Forfeited
(2,800
)
 
5.70

Balance as of December 31, 2013
516,500

 
$
9.43
Restricted Stock
  
Class of Stock  
Schedule of Nonvested Share Activity
The following is a summary of the activity in our restricted common stock during 2013:
 
Restricted Common Stock
 
Weighted
Average Grant
Date Fair Value
Balance as of December 31, 2012
376,500

 
$
9.98

Granted
475,500

 
10.49

Vested
(142,500
)
 
10.01

Forfeited
(68,500
)
 
10.06

Balance as of December 31, 2013
641,000

 
$
10.34