Revolving Credit Facility (Narrative) (Details)	9 Months Ended
	Sep. 30, 2016 USD ($)
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 15,000,000
Credit facility, amount outstanding	$ 0
Debt instrument, description of variable rate basis	prime rate or LIBOR plus 2.5%
Line of credit facility, unused capacity, commitment fee percentage	0.25%
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	2.50%
Revolving Credit Facility B [Member]
Line of Credit Facility [Line Items]
Credit facility, amount outstanding	$ 30,000,000
Letter of Credit [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 5,000,000
Line of credit facility, commitment fee percentage	1.00%