Long-Term Debt And Capital Lease Obligations (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2012
Long-Term Debt And Capital Lease Obligations [Line Items]
Senior notes maturity date	July 15, 2012
3 3/4% Senior Subordinated Convertible Notes Due 2012 [Member]
Long-Term Debt And Capital Lease Obligations [Line Items]
Conversion threshold price for Convertible Notes	37.50
Minimum trading days required for common stock closing price exceeding conversion threshold price	20
Number of consecutive trading days in the measurement period	30