This excerpt taken from the HPT 8-K filed Dec 12, 2006.
We recognize derivatives as either assets or liabilities on the balance sheet and measure those instruments at fair value. The accounting for changes in the fair value of a derivative depends on the intended use of the derivative and the resulting designation. We designate our derivatives based upon criteria established by FAS 133, "Accounting for Derivative Instruments and Hedging Activities." For a derivative designated as a fair value hedge, the change in fair value is recognized in earnings in the period of change together with the offsetting loss or gain on the hedged item attributed to the risk being hedged. For a derivative designated as a cash flow hedge, the effective portion of the derivative's gain or loss is initially reported as a component of accumulated other comprehensive income (loss) and subsequently reclassified into earnings when the hedged exposure affects earnings. The ineffective portion of the gain or loss is reported in earnings immediately. We use derivatives to manage risk arising from changes in interest rates. Our objectives for holding derivatives are to decrease the volatility of earnings and cash flows associated with changes in interest rates. See Note 21.