Change in accumulated gains and losses from derivative instrument designated and qualifying as the effective portion of cash flow hedges, net of tax effect. The after tax effect change includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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+ Details

Derivative Financial Instruments (Details) (USD $)	3 Months Ended		9 Months Ended		1 Months Ended
Derivative Financial Instruments (Details) (USD $)	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Oct. 31, 2008 SGI	Oct. 17, 2008 SGI	Sep. 30, 2011 Level 2
Derivatives Fair Value
Period of interest rate swap agreement (in years)					3Y
Notional amount of debt						$ 100,000,000
Interest rate swap, fixed interest rate (as a percent)						3.49%
Interest rate swap, variable interest rate description					three-month LIBOR
Fair value of interest rate swap agreement							126
Gain on derivative financial instruments	$ 505,000	$ 27,000	$ 1,417,000	$ 315,000