Credit Facilities (Details) (Revolving Credit Facility, USD $)	Mar. 31, 2015 letter_of_credit	Dec. 10, 2014
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	1,400,000
Number of standby letters of credit outstanding	5
Sixth Amendment
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity		$ 15,000,000.00