Banking Facilities and Debt (Details)		3 Months Ended		4 Months Ended
	May. 07, 2015 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	May. 06, 2015 USD ($)
Banking facilities and other debt
Paid off the outstanding Term loan and Draw term loan	$ 15,400,000
Interest rate swaps
Interest rate hedges
Quarterly settlement payment pursuant to hedges	500,000		$ 200,000
Minimum
Interest rate hedges
Pro forma Cash Flow Leverage Ratio to be maintained to purchase, redeem or otherwise acquire shares of common stock		3.00
Minimum | LIBOR
Banking facilities and other debt
Interest rate margin (as a percent)				1.75%
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
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
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