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(Debt, Schedule of Ratio of Net Indebtedness) (Details)	12 Months Ended
(Debt, Schedule of Ratio of Net Indebtedness) (Details)	Dec. 31, 2011
Line Of Credit Facility Leverage Range [Line Items]
Percent Of Unused Portion Line Of Credit Facility Trigerring Lower Commitment Fee Percentage	50.00%
Less than 4.00 to 1.00 [Member]
Summary of leverage and applicable margin
Line Of Credit Facility Applicable Margin Rate	2.25%
Greater than or equal to 4.00 to 1.00 but less than 5.00 to 1.00 [Member]
Summary of leverage and applicable margin
Line Of Credit Facility Applicable Margin Rate	2.50%
Greater than or equal to 5.00 to 1.00 but less than 5.50 to 1.00 [Member]
Summary of leverage and applicable margin
Line Of Credit Facility Applicable Margin Rate	2.75%
Greater than or equal to 5.50 to 1.00 but less than 6.00 to 1.00 [Member]
Summary of leverage and applicable margin
Line Of Credit Facility Applicable Margin Rate	3.00%
Greater than or equal to 6.00 to 1.00 [Member]
Summary of leverage and applicable margin
Line Of Credit Facility Applicable Margin Rate	3.25%
Minimum [Member]
Line Of Credit Facility Leverage Range [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.40%
Minimum [Member] \| Greater than or equal to 4.00 to 1.00 but less than 5.00 to 1.00 [Member]
Summary of leverage and applicable margin
Ratio Of Net Indebtedness to Ebitda	4
Minimum [Member] \| Greater than or equal to 5.00 to 1.00 but less than 5.50 to 1.00 [Member]
Summary of leverage and applicable margin
Ratio Of Net Indebtedness to Ebitda	5
Minimum [Member] \| Greater than or equal to 5.50 to 1.00 but less than 6.00 to 1.00 [Member]
Summary of leverage and applicable margin
Ratio Of Net Indebtedness to Ebitda	5.5
Minimum [Member] \| Greater than or equal to 6.00 to 1.00 [Member]
Summary of leverage and applicable margin
Ratio Of Net Indebtedness to Ebitda	6
Maximum [Member]
Line Of Credit Facility Leverage Range [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.30%
Maximum [Member] \| Less than 4.00 to 1.00 [Member]
Summary of leverage and applicable margin
Ratio Of Net Indebtedness to Ebitda	4
Maximum [Member] \| Greater than or equal to 4.00 to 1.00 but less than 5.00 to 1.00 [Member]
Summary of leverage and applicable margin
Ratio Of Net Indebtedness to Ebitda	5
Maximum [Member] \| Greater than or equal to 5.00 to 1.00 but less than 5.50 to 1.00 [Member]
Summary of leverage and applicable margin
Ratio Of Net Indebtedness to Ebitda	5.5
Maximum [Member] \| Greater than or equal to 5.50 to 1.00 but less than 6.00 to 1.00 [Member]
Summary of leverage and applicable margin
Ratio Of Net Indebtedness to Ebitda	6