Line of Credit and Long-Term Debt - Line of Credit (Details)	3 Months Ended
	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2013 USD ($)
Line of Credit Facility [Line Items]
Long-term debt	$ 76,153,000	$ 74,215,000
Selected LIBOR rate
Line of Credit Facility [Line Items]
Interest rate on line of credit, variable rate	1.50%
LIBOR for a fixed rate term
Line of Credit Facility [Line Items]
Interest rate on line of credit, variable rate	1.50%
Term Notes
Line of Credit Facility [Line Items]
Line of credit amount	$ 70,000,000
Interest pay rate	4.11%
Periodic payments, interest only period	2 years
Term Notes | Selected LIBOR rate
Line of Credit Facility [Line Items]
Interest rate on line of credit, variable rate	1.70%
Revolving line of credit
Line of Credit Facility [Line Items]
Line of credit amount	$ 30,000,000
Commitment fee percentage	0.10%
Liquid assets	$ 20,000,000
Revolving line of credit | Maximum
Line of Credit Facility [Line Items]
Debt equity ratio	0.75
Revolving line of credit | Minimum
Line of Credit Facility [Line Items]
Debt service coverage ratio	1.25
Revolving line of credit
Line of Credit Facility [Line Items]
Long-term debt	$ 2,000,000	$ 0
Promissory note agreement
Line of Credit Facility [Line Items]
Long-term debt	$ 4,153,000
Debt instrument face amount			$ 4,750,000
Stated interest rate			4.25%