Banking Facilities and Debt (Details)		3 Months Ended	4 Months Ended	9 Months Ended
	May 07, 2015 USD ($)	Mar. 31, 2015 USD ($)	May 06, 2015 USD ($)	Sep. 30, 2016 USD ($)
Interest rate swaps
Interest rate hedges
Quarterly settlement payment pursuant to hedges	$ 500,000	$ 200,000
Minimum | LIBOR
Banking facilities and other debt
Interest rate margin (as a percent)			1.75%
Maximum
Interest rate hedges
Pro forma Cash Flow Leverage Ratio to be maintained to purchase, redeem or otherwise acquire shares of common stock				3.00
New Revolving Facility
Banking facilities and other debt
Maximum borrowing capacity	$ 75,000,000
Accordion feature period	4 years
Maximum borrowing capacity accordion feature	$ 50,000,000
Time period used for Cash Flow Leverage Ratio under the new revolving facility	12 months
New Revolving Facility | Minimum
Banking facilities and other debt
Commitment fee (as a percent)	0.20%
New Revolving Facility | Minimum | LIBOR
Banking facilities and other debt
Interest rate margin (as a percent)	1.00%
New Revolving Facility | Minimum | Lender's prime rate
Banking facilities and other debt
Interest rate margin (as a percent)	0.00%
New Revolving Facility | Maximum
Banking facilities and other debt
Commitment fee (as a percent)	0.35%
New Revolving Facility | Maximum | LIBOR
Banking facilities and other debt
Interest rate margin (as a percent)	2.00%
New Revolving Facility | Maximum | Lender's prime rate
Banking facilities and other debt
Interest rate margin (as a percent)	1.00%
Term Loan And Draw Term Loan
Banking facilities and other debt
Outstanding Term loan and Draw term loan paid off	$ 15,400,000
Term Loan
Banking facilities and other debt
Term			10 years
Face amount of term loan			$ 40,000,000
Quarterly principal payments			800,000
Final principal payment			$ 7,500,000
Term Loan | LIBOR | Interest rate swaps
Interest rate hedges
LIBOR (as a percent)			4.695%
Current interest rate (as a percent)			6.445%
Draw Term Loan
Banking facilities and other debt
Term			10 years
Face amount of term loan			$ 20,000,000
Quarterly principal payments			400,000
Final principal payment			$ 5,400,000
75% of the outstanding balance of the Draw Term Loan | Interest rate swaps
Interest rate hedges
Percentage of outstanding balance of debt hedged			75.00%
75% of the outstanding balance of the Draw Term Loan | LIBOR | Interest rate swaps
Interest rate hedges
LIBOR (as a percent)			4.875%
Current interest rate (as a percent)			6.625%
25% of the outstanding balance of the Draw Term Loan | Interest rate swaps
Interest rate hedges
Percentage of outstanding balance of debt hedged			25.00%
25% of the outstanding balance of the Draw Term Loan | LIBOR | Interest rate swaps
Interest rate hedges
LIBOR (as a percent)			5.50%
Current interest rate (as a percent)			7.25%
Revolving Facility
Banking facilities and other debt
Maximum borrowing capacity			$ 30,000,000
Letters of credit outstanding				$ 700,000