Debt And Capital Lease Obligations (Revolving Credit Facility) (Details) (USD $)			9 Months Ended			3 Months Ended		12 Months Ended
	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2011 New Credit Facility [Member]	Mar. 11, 2011 New Credit Facility [Member]	Mar. 11, 2011 Prior Credit Facility [Member]	Sep. 30, 2011 Interest Coverage Ratio, EBITDA [Member]	Sep. 30, 2011 Interest Coverage Ratio, Consolidated Interest Expense [Member]	Dec. 31, 2013 Debt-to-EBITDA Ratio, Debt [Member]	Dec. 31, 2012 Debt-to-EBITDA Ratio, Debt [Member]	Dec. 31, 2013 Debt-to-EBITDA Ratio, EBITDA [Member]	Dec. 31, 2012 Debt-to-EBITDA Ratio, EBITDA [Member]
Line of credit, maximum borrowing capacity				$ 300,000,000	$ 400,000,000
Credit facility, amount outstanding	$ 0	$ 0			$ 0
Line of Credit Facility, Covenant Terms						4.00	1.00	2.75	3.00	1.00	1.00
Line of Credit Facility, Expiration Date			March 11, 2015