Revolving Credit Facility Payable (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	0 Months Ended		0 Months Ended
	Mar. 31, 2014	Jan. 27, 2006 Revolving Credit Facility [Member]	Mar. 31, 2014 Revolving Credit Facility [Member]	Jan. 27, 2006 Letter of Credit [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity		$ 15.0
Line of credit facility, amount outstanding			$ 1.5
Line of credit facility, interest rate during period	2.73%
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%
Line of credit facility, commitment fee percentage				1.00%