Credit Facilities (Narrative) (Details)	Nov. 10, 2015	Dec. 31, 2015 USD ($) letter_of_credit	Dec. 10, 2014 USD ($)	Dec. 09, 2014 USD ($)
London Interbank Offered Rate (LIBOR) [Member] | Seventh Amendment [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	2.50%
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Long-term line of credit		$ 0
Revolving Credit Facility [Member] | LIBOR Rate Loan [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity				$ 35,000,000
Standby letters of credit, total amount outstanding		$ 700,000
Number of standby letters of credit outstanding | letter_of_credit		2
Remaining borrowing capacity		$ 7,400,000
Revolving Credit Facility [Member] | Sixth Amendment [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity			$ 15,000,000.00