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Consolidated Statements of Comprehensive Operations (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Other comprehensive income (loss), net of income tax:
Tax for interest rate lock derivative contracts reclassified to income	$ 43,000	$ 43,000	$ 43,000
Tax for change in fair value of interest rate lock derivative contracts designated as a hedge	$ 0	$ 62,000	$ 0

Tax effect on reclassification adjustment for accumulated gains and losses from derivative instrument designated and qualifying as the effective portion of cash flow hedges included in accumulated comprehensive income that was realized in net income during the period.

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- Definition

Tax effect on the change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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