Notes Payable (Credit Facility Table) (Details)	12 Months Ended
	Dec. 31, 2013
Less than or equal to 40%
Line of Credit Facility [Line Items]
Annual Facility Fee (percent)	0.20%
Leverage ratio, upper limit (percent)	40.00%
Greater than 40% but less than or equal to 50%
Line of Credit Facility [Line Items]
Annual Facility Fee (percent)	0.25%
Leverage ratio, upper limit (percent)	50.00%
Line of Credit, Leverage Ratio, Lower Limit	40.00%
Greater than 50% but less than or equal to 55%
Line of Credit Facility [Line Items]
Annual Facility Fee (percent)	0.35%
Leverage ratio, upper limit (percent)	55.00%
Line of Credit, Leverage Ratio, Lower Limit	50.00%
Greater than 55% but less than or equal to 60%
Line of Credit Facility [Line Items]
Annual Facility Fee (percent)	0.40%
Leverage ratio, upper limit (percent)	60.00%
Line of Credit, Leverage Ratio, Lower Limit	55.00%
Base rate [Member] | Less than or equal to 40%
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.50%
Base rate [Member] | Greater than 40% but less than or equal to 50%
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.60%
Base rate [Member] | Greater than 50% but less than or equal to 55%
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.90%
Base rate [Member] | Greater than 55% but less than or equal to 60%
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.10%
LIBOR [Member] | Less than or equal to 40%
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.50%
LIBOR [Member] | Greater than 40% but less than or equal to 50%
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.60%
LIBOR [Member] | Greater than 50% but less than or equal to 55%
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.90%
LIBOR [Member] | Greater than 55% but less than or equal to 60%
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.10%
Line of Credit [Member]
Line of Credit Facility [Line Items]
Leverage ratio, upper limit (percent)	60.00%
Line of Credit [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Construction Loans [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Interest Rate at Period End	1.82%
Construction Loans [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.65%