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Notes Payable - Minimum Future Payments Due on Notes Payable (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Debt Disclosure [Abstract]    
2014 $ 17,896  
2015 59,238  
2016 295,512  
2017 5,623  
2018 290,228  
Thereafter 257,491  
Total $ 925,988 $ 580,884