Credit Facilities (Details) - Jun. 30, 2015 - Revolving Credit Facility	USD ($) letter_of_credit
LIBOR Rate Loan
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 35,000,000
Credit facility, interest rate on outstanding balance	3.30%
Standby letters of credit, total amount outstanding	$ 1,200,000
Number of standby letters of credit outstanding | letter_of_credit	4
Sixth Amendment
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 15,000,000.00