Long-Term Debt Convertible Senior Subordinated Notes (Details) (Convertible Debt [Member], 5 1/2% Convertible Senior Subordinated Notes Due 2014 [Member], USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended
	Jul. 31, 2009	Mar. 31, 2012	Jul. 02, 2009
Convertible Debt [Member] | 5 1/2% Convertible Senior Subordinated Notes Due 2014 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount			$ 100,000
Debt instrument, interest rate		5.50%	5.50%
Debt instrument, increase, additional borrowings	15,000
Debt instrument, convertible, principal conversion tranche	$ 1,000
Debt instrument, convertible, conversion ratio (in shares)	198.8862