Financial Instruments	12 Months Ended
Dec. 31, 2011
Financial Instruments [Abstract]
Financial Instruments	3) FINANCIAL INSTRUMENTS *Fair Value Hedges:* During 2011, 2010 and 2009, we had no fair value hedges outstanding. *Cash Flow Hedges:* We manage our ratio of fixed to floating rate debt with the objective of achieving a mix that management believes is appropriate. To manage this risk in a cost-effective manner, we, from time to time, enter into interest rate swap agreements in which we agree to exchange various combinations of fixed and/or variable interest rates based on agreed upon notional amounts. We account for our derivative and hedging activities using the Financial Accounting Standard Board's ("FASB") guidance which requires all derivative instruments, including certain derivative instruments embedded in other contracts, to be carried at fair value on the balance sheet. For derivative transactions designated as hedges, we formally document all relationships between the hedging instrument and the related hedged item, as well as its risk-management objective and strategy for undertaking each hedge transaction. Derivative instruments designated in a hedge relationship to mitigate exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. Cash flow hedges are accounted for by recording the fair value of the derivative instrument on the balance sheet as either an asset or liability, with a corresponding amount recorded in accumulated other comprehensive income ("AOCI") within stockholders' equity. Amounts are reclassified from AOCI to the income statement in the period or periods the hedged transaction affects earnings. We use interest rate derivatives in our cash flow hedge transactions. Such derivatives are designed to be highly effective in offsetting changes in the cash flows related to the hedged liability. For derivative instruments designated as cash flow hedges, the ineffective portion of the change in expected cash flows of the hedged item are recognized currently in the income statement. For hedge transactions that do not qualify for the short-cut method, at the hedge's inception and on a regular basis thereafter, a formal assessment is performed to determine whether changes in the fair values or cash flows of the derivative instruments have been highly effective in offsetting changes in cash flows of the hedged items and whether they are expected to be highly effective in the future. The fair value of interest rate swap agreements approximates the amount at which they could be settled, based on estimates obtained from the counterparties. We assess the effectiveness of our hedge instruments on a quarterly basis. We performed periodic assessments of the cash flow hedge instruments during 2011 and 2010 and determined the hedges to be highly effective. We also determined that no portion of the hedges is ineffective and therefore there was no material effect on our consolidated financial position, operations or cash flows. The counterparties to the interest rate swap agreements expose us to credit risk in the event of nonperformance. However, at December 31, 2011, each swap agreement entered into by us was in a net liability position which would require us to make the net settlement payments to the counterparties. We do not anticipate nonperformance by those counterparties. We do not hold or issue derivative financial instruments for trading purposes. During the first quarter of 2011, we entered into an interest rate cap on a total notional amount of $275 million whereby we paid a premium of $30,000 in exchange for the counterparty agreeing to pay the difference between 2.25% and three-month LIBOR if the three-month LIBOR rate rises above 2.25% during the term of the cap, which expired in December, 2011. The three-month LIBOR never reached 2.25% during the term of the cap. Therefore, no payment was made to us. We also entered into a forward starting interest rate cap on a total notional amount of $450 million from December, 2011 to December, 2012 reducing to $400 million from December, 2012 to December, 2013 whereby we paid a premium of $740,000 in exchange for the counterparty agreeing to pay the difference between 7.00% and three-month LIBOR if the three-month LIBOR rate rises above 7.00% during the term of the cap. If the three-month LIBOR does not reach 7.00% during the term of the cap, no payment is made to us. We also entered into six additional forward starting interest rate swaps in the first quarter of 2011 whereby we pay a fixed rate on a total notional amount of $425 million and receive three-month LIBOR. Three of these swaps with a total notional amount of $225 million became effective in March, 2011 and will mature in May, 2015. The average fixed rate payable on these swaps is 1.91%. The three remaining interest rate swaps with total notional amounts of $100 million, $25 million and $75 million became effective in December, 2011 and have fixed rates of 2.50%, 1.96% and 1.32%, and maturity dates in December, 2014, December, 2013 and December, 2012, respectively. During the fourth quarter of 2010, we entered into three interest rate caps on a total notional amount of $1 billion whereby we paid a premium of $240,000 in exchange for the counterparties agreeing to pay the difference between 2.25% and three-month LIBOR if the three-month LIBOR rate rises above 2.25% during the term of the caps. All of these caps expired in December, 2011. The three-month LIBOR rate never rose above 2.25% during the term of the caps. Therefore, no payments were made to us. We also entered into four forward starting interest rate swaps in the fourth quarter of 2010 whereby we pay a fixed rate on a total notional amount of $600 million and receive three-month LIBOR. Each of the four swaps became effective in December, 2011 and will mature in May, 2015. The average fixed rate payable on these swaps is 2.38%. During the fourth quarter of 2007, we entered into two interest rate swaps whereby we pay a fixed rate on a total notional principal amount of $150 million and receive three-month LIBOR. Each of the two interest rate swaps had an initial notional principal amount of $75 million. The notional amount of the first interest rate swap reduced to $50 million in October, 2010.The fixed rate payable is 4.76% and it matures in October, 2012. The fixed rate payable on the second interest rate swap was 4.87% and it matured in October, 2011. We measure our interest rate swaps at fair value on a recurring basis. The fair value of our interest rate swaps is based primarily on quotes from banks. We consider those inputs to be "level 3" in the fair value hierarchy as outlined in the authoritative guidance for disclosures in connection with derivative instruments and hedging activities. The fair value of our interest rate swaps was a liability of $48 million at December 31, 2011, of which $4 million is included in other current liabilities and $44 million is included in other noncurrent liabilities on the accompanying balance sheet. The fair value of our interest rate swaps was a liability of $10 million at December 31, 2010, of which $2 million is included in other current liabilities and $8 million is included in other noncurrent liabilities.

3) FINANCIAL INSTRUMENTS

Fair Value Hedges:

During 2011, 2010 and 2009, we had no fair value hedges outstanding.

Cash Flow Hedges:

We manage our ratio of fixed to floating rate debt with the objective of achieving a mix that management believes is appropriate. To manage this risk in a cost-effective manner, we, from time to time, enter into interest rate swap agreements in which we agree to exchange various combinations of fixed and/or variable interest rates based on agreed upon notional amounts. We account for our derivative and hedging activities using the Financial Accounting Standard Board's ("FASB") guidance which requires all derivative instruments, including certain derivative instruments embedded in other contracts, to be carried at fair value on the balance sheet. For derivative transactions designated as hedges, we formally document all relationships between the hedging instrument and the related hedged item, as well as its risk-management objective and strategy for undertaking each hedge transaction.

Derivative instruments designated in a hedge relationship to mitigate exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. Cash flow hedges are accounted for by recording the fair value of the derivative instrument on the balance sheet as either an asset or liability, with a corresponding amount recorded in accumulated other comprehensive income ("AOCI") within stockholders' equity. Amounts are reclassified from AOCI to the income statement in the period or periods the hedged transaction affects earnings. We use interest rate derivatives in our cash flow hedge transactions. Such derivatives are designed to be highly effective in offsetting changes in the cash flows related to the hedged liability. For derivative instruments designated as cash flow hedges, the ineffective portion of the change in expected cash flows of the hedged item are recognized currently in the income statement.

For hedge transactions that do not qualify for the short-cut method, at the hedge's inception and on a regular basis thereafter, a formal assessment is performed to determine whether changes in the fair values or cash flows of the derivative instruments have been highly effective in offsetting changes in cash flows of the hedged items and whether they are expected to be highly effective in the future.

The fair value of interest rate swap agreements approximates the amount at which they could be settled, based on estimates obtained from the counterparties. We assess the effectiveness of our hedge instruments on a quarterly basis. We performed periodic assessments of the cash flow hedge instruments during 2011 and 2010 and determined the hedges to be highly effective. We also determined that no portion of the hedges is ineffective and therefore there was no material effect on our consolidated financial position, operations or cash flows. The counterparties to the interest rate swap agreements expose us to credit risk in the event of nonperformance. However, at December 31, 2011, each swap agreement entered into by us was in a net liability position which would require us to make the net settlement payments to the counterparties. We do not anticipate nonperformance by those counterparties. We do not hold or issue derivative financial instruments for trading purposes.

During the first quarter of 2011, we entered into an interest rate cap on a total notional amount of $275 million whereby we paid a premium of $30,000 in exchange for the counterparty agreeing to pay the difference between 2.25% and three-month LIBOR if the three-month LIBOR rate rises above 2.25% during the term of the cap, which expired in December, 2011. The three-month LIBOR never reached 2.25% during the term of the cap. Therefore, no payment was made to us. We also entered into a forward starting interest rate cap on a total notional amount of $450 million from December, 2011 to December, 2012 reducing to $400 million from December, 2012 to December, 2013 whereby we paid a premium of $740,000 in exchange for the counterparty agreeing to pay the difference between 7.00% and three-month LIBOR if the three-month LIBOR rate rises above 7.00% during the term of the cap. If the three-month LIBOR does not reach 7.00% during the term of the cap, no payment is made to us.

We also entered into six additional forward starting interest rate swaps in the first quarter of 2011 whereby we pay a fixed rate on a total notional amount of $425 million and receive three-month LIBOR. Three of these swaps with a total notional amount of $225 million became effective in March, 2011 and will mature in May, 2015. The average fixed rate payable on these swaps is 1.91%. The three remaining interest rate swaps with total notional amounts of $100 million, $25 million and $75 million became effective in December, 2011 and have fixed rates of 2.50%, 1.96% and 1.32%, and maturity dates in December, 2014, December, 2013 and December, 2012, respectively.

During the fourth quarter of 2010, we entered into three interest rate caps on a total notional amount of $1 billion whereby we paid a premium of $240,000 in exchange for the counterparties agreeing to pay the difference between 2.25% and three-month LIBOR if the three-month LIBOR rate rises above 2.25% during the term of the caps. All of these caps expired in December, 2011. The three-month LIBOR rate never rose above 2.25% during the term of the caps. Therefore, no payments were made to us. We also entered into four forward starting interest rate swaps in the fourth quarter of 2010 whereby we pay a fixed rate on a total notional amount of $600 million and receive three-month LIBOR. Each of the four swaps became effective in December, 2011 and will mature in May, 2015. The average fixed rate payable on these swaps is 2.38%.

During the fourth quarter of 2007, we entered into two interest rate swaps whereby we pay a fixed rate on a total notional principal amount of $150 million and receive three-month LIBOR. Each of the two interest rate swaps had an initial notional principal amount of $75 million. The notional amount of the first interest rate swap reduced to $50 million in October, 2010.The fixed rate payable is 4.76% and it matures in October, 2012. The fixed rate payable on the second interest rate swap was 4.87% and it matured in October, 2011.

We measure our interest rate swaps at fair value on a recurring basis. The fair value of our interest rate swaps is based primarily on quotes from banks. We consider those inputs to be "level 3" in the fair value hierarchy as outlined in the authoritative guidance for disclosures in connection with derivative instruments and hedging activities. The fair value of our interest rate swaps was a liability of $48 million at December 31, 2011, of which $4 million is included in other current liabilities and $44 million is included in other noncurrent liabilities on the accompanying balance sheet. The fair value of our interest rate swaps was a liability of $10 million at December 31, 2010, of which $2 million is included in other current liabilities and $8 million is included in other noncurrent liabilities.