Notes Payable (Repurchase Agreements Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Debt Disclosure [Abstract]
Repurchase agreement, maximum amount borrowed			$ 138,700,000	$ 258,600,000
Repurchase agreement, average borrowings	$ 882,000	$ 131,500,000	$ 9,400,000	$ 47,500,000
Repurchase agreement, weighted average interest rate	0.35%	0.17%	0.15%	0.18%