Debt (Details) (USD $)	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Mar. 31, 2013
Debt [Abstract]
Credit facility, maximum borrowing capacity	$ 300,000,000
Credit facility, expiration date	Mar. 21, 2017
Credit facility, permitted increase in maximum borrowing capacity	200,000,000
Amount outstanding under the amended credit facility	15,000,000		18,000,000
Restriction on maximum additional borrowing outside amended credit facility	250,000,000
Cushion below consolidated total leverage ratio, minimum (in ratio)	0.25
Consolidated total leverage ratio, maximum (in ratio)	2.5
Threshold over which the company is required to maintain a minimum cushion below its consolidated total leverage ratio, maximum	50,000,000
Base rate percentage of borrowings under the credit facility bear interest	the base rate (the greatest of the prime rate, the federal funds effective rate plus one percent, or the daily LIBOR rate plus one percent) or the Eurodollar rate, at the Company's option, plus the applicable margin (which is based on the level of maximum total debt to EBITDA ratio).
Weighted average interest rate (in hundredths)	2.20%
Interest and fees related to the credit facility	229,000	482,000
Cash paid for interest amounts	$ 266,000	$ 512,000