Commitments and Contingencies (Details) (Garden City lease, USD $) In Thousands, unless otherwise specified	1 Months Ended
	Oct. 31, 2003 Y	May 31, 2012	Oct. 03, 2003
Garden City lease
Sale-leaseback transaction
Net proceeds from sale of facility	$ 13,991
Cost of the facility			9,472
Accumulated depreciation of the facility			4,595
Deferred gain realized on the sale			9,114
Deferred gain amortization period (in years)	20
Unamortized balance of the deferred gain		$ 5,227