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Real Estate (Tables)
 12 Months Ended
Dec. 31, 2017
Real Estate [Abstract]  
Schedule of real estate properties
Investment in real estate represents directly owned property held for investment, as follows:    
 
As of December 31,
(In thousands)
2017
 
2016
Properties in operation
$
451,691

 
$
457,237

Properties under development
1,017,910

 
727,744

Total
$
1,469,601

 
$
1,184,981