Revolving Credit Facility Payable (Narrative) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Jan. 27, 2006
Line of Credit Facility [Line Items]
Line of credit facility, interest rate during period	2.75%
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity		$ 15.0
Line of credit facility, amount outstanding	$ 1.5
Debt instrument, description of variable rate basis	prime rate or LIBOR plus 2.5%
Debt instrument, basis spread on variable rate	2.50%
Line of credit facility, unused capacity, commitment fee Percentage	0.25%
Letter of Credit [Member]
Line of Credit Facility [Line Items]
Line of credit facility, commitment fee percentage	1.00%