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Real Estate Investments (Tables)
 12 Months Ended
Dec. 31, 2014
Real Estate [Abstract]  
Schedule of Real Estate Investments, Net
Real estate investments, net, represents investments in 19 rental properties and the corporate headquarters building and is summarized as follows:
 
 
December 31,
2014
 
December 31,
2013
 
(in thousands)
Land and improvements
$
454,181

 
$
382,581

Building and improvements
2,288,664

 
2,050,533

Construction in progress
2,576

 
61,677

Total real estate investments
2,745,421

 
2,494,791

Less accumulated depreciation
(565,297
)
 
(484,488
)
Real estate investments, net
$
2,180,124

 
$
2,010,303