Subsequent Events (Details) (USD $)	0 Months Ended	3 Months Ended		0 Months Ended
	Mar. 19, 2015	Mar. 31, 2015	Mar. 31, 2014	May 07, 2015	Apr. 29, 2015
Subsequent events
Quarterly cash dividend (in dollars per share)	$ 0.125
Dividends payable date of record		Feb. 27, 2015
LIBOR
Subsequent events
Interest rate basis		LIBOR
LIBOR | Minimum
Subsequent events
Interest rate margin (as a percent)		1.75%
LIBOR | Maximum
Subsequent events
Interest rate margin (as a percent)		2.75%
Interest rate swaps
Subsequent events
Settlement payment due on hedges		200,000	$ 200,000
Subsequent event
Subsequent events
Quarterly cash dividend (in dollars per share)					$ 0.125
Dividends payable date declared					Apr. 29, 2015
Dividends payable date of record					May 29, 2015
Dividends payable date to be paid					Jun. 19, 2015
Paid off the outstanding Term loan and Draw term loan				15,400,000
Reduction in interest expense				500,000
Subsequent event | New Revolving Facility
Subsequent events
Maximum borrowing capacity				75,000,000
Accordion feature period				4 years
Maximum borrowing capacity accordion feature				50,000,000
Subsequent event | New Revolving Facility | Minimum
Subsequent events
Commitment fee (as a percent)				0.20%
Subsequent event | New Revolving Facility | Maximum
Subsequent events
Commitment fee (as a percent)				0.35%
Subsequent event | New Revolving Facility | LIBOR
Subsequent events
Interest rate basis				LIBOR
Subsequent event | New Revolving Facility | LIBOR | Minimum
Subsequent events
Interest rate margin (as a percent)				1.00%
Subsequent event | New Revolving Facility | LIBOR | Maximum
Subsequent events
Interest rate margin (as a percent)				2.00%
Subsequent event | Interest rate swaps
Subsequent events
Settlement payment due on hedges				500,000
Additional interest expense				$ 300,000