Notes Payable (Details) (USD $)	6 Months Ended
	Jun. 30, 2013
Principal payments due on notes payable
Principal amount	$ 143,770,000
July1,2013toDecember31,2013
Principal payments due on notes payable
Principal amount	1,186,000
2014 [Member]
Principal payments due on notes payable
Principal amount	8,597,000
2015 [Member]
Principal payments due on notes payable
Principal amount	25,420,000
2016 [Member]
Principal payments due on notes payable
Principal amount	9,023,000
2017 [Member]
Principal payments due on notes payable
Principal amount	2,098,000
2018 and Thereafter [Member]
Principal payments due on notes payable
Principal amount	$ 97,446,000