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(Schedule of Ratio of Net Indebtedness) (Details)	3 Months Ended
(Schedule of Ratio of Net Indebtedness) (Details)	Mar. 31, 2013
Line Of Credit Facility Leverage Range [Line Items]
Percent of unused portion line of credit facility trigerring lower commitment fee (as a percent)	50.00%
Less than 4.00 to 1.00 [Member]
Summary of leverage and applicable margin
Line of credit facility applicable margin rate	1.75%
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	1.90%
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	2.10%
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	2.20%
Greater than or equal to 6.00 to 1.00 [Member]
Summary of leverage and applicable margin
Line of credit facility applicable margin rate	2.50%
Greater than or equal to 6.50 to 1.00 [Member]
Summary of leverage and applicable margin
Line of credit facility applicable margin rate	2.75%
Minimum [Member]
Line Of Credit Facility Leverage Range [Line Items]
Line of credit facility, unused capacity, commitment fee (as a percent)	0.35%
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 (as a percent)	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 (as a percent)	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 (as a percent)	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 (as a percent)	6
Minimum [Member] \| Greater than or equal to 6.50 to 1.00 [Member]
Summary of leverage and applicable margin
Ratio of net indebtedness to EBITDA (as a percent)	6.50
Maximum [Member]
Line Of Credit Facility Leverage Range [Line Items]
Line of credit facility, unused capacity, commitment fee (as a percent)	0.25%
Maximum [Member] \| Less than 4.00 to 1.00 [Member]
Summary of leverage and applicable margin
Ratio of net indebtedness to EBITDA (as a percent)	4.00
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 (as a percent)	5.00
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 (as a percent)	5.50
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 (as a percent)	6.00