Subsequent Event New Swap Agreement (Details) (USD $) In Thousands, unless otherwise specified	1 Months Ended
	Jul. 31, 2011	Jun. 03, 2011
Subsequent Event New Swap Agreement (Textuals) [Abstract]
Effective date of interest rate of swap	40848
Interest rate agreement, Amount		$ 100,000
Fixed rate to be paid by Company		1.715%
Variable interest rate to be received by Company	Based on the 1-month LIBOR
Premium or Discount incurred in interest rate swap	$ 0