Long-Term Debt (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended				3 Months Ended	12 Months Ended					6 Months Ended			12 Months Ended			6 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Apr. 04, 2011	Mar. 31, 2011 Note Warrant2 [Member]	Dec. 31, 2011 Convertible Note Hedge 2 [Member]	Dec. 31, 2011 Convertible Note Hedge [Member]	Dec. 31, 2011 Convertible Note Hedge 1 [Member]	Dec. 31, 2011 Convertible Note/ Hedge Warrant, net [Member]	Mar. 29, 2011 Convertible Note Overallotment [Member]	Jun. 30, 2012 Convertible Debt [Member]	Mar. 31, 2014 Convertible Debt [Member]	Dec. 31, 2013 Convertible Debt [Member]	Dec. 31, 2012 Convertible Debt [Member] Convertible Notes 2016 [Member]	Apr. 04, 2011 Convertible Debt [Member] Convertible Notes 2016 [Member]	Mar. 29, 2011 Convertible Debt 1 [Member]	Jun. 30, 2012 Other Long-term Liabilities [Member] Convertible Debt [Member]	Apr. 04, 2011 Other Long-term Liabilities [Member] Convertible Debt [Member]	Jun. 30, 2012 Equity [Member] Convertible Debt [Member]	Apr. 04, 2011 Equity [Member] Convertible Debt [Member]	Mar. 30, 2011 Equity [Member] Convertible Debt [Member]	Mar. 29, 2011 Equity [Member] Convertible Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount															$ 230,000,000
LONG-TERM DEBT	211,000,000		208,800,000
Interest Expense, Debt, Excluding Amortization	1,438,000	1,438,000
Accretion of Discount	2,179,000	2,033,000
Amortization of Financing Costs	326,000	326,000
Proceeds from Issuance of Warrants					27,600,000
Senior Notes	210,992,000		(208,813,000)							30,000,000		230,000,000	230,000,000			200,000,000		187,000,000		43,000,000
Debt Instrument, Unamortized Discount	19,008,000		(21,187,000)
Senior Convertible Notes [Equity net of tax]																				28,000,000
Debt Conversion, Converted Instrument, Amount														1,000
Debt Instrument, Convertible, Conversion Price															$ 55.69
Class of Warrant or Right, Outstanding																					0.5	3.5
Warrant Option Strike Price																						$ 64.09
Proceeds from (Payments for) Other Financing Activities						5,600,000	42,700,000	37,100,000	10,900,000
Debt Instrument, Interest Rate, Effective Percentage				7.00%
Payments of Debt Issuance Costs											8,000,000						6,500,000		(1,500,000)
Debt Instrument, Interest Rate, Stated Percentage															2.50%
Debt Instrument, Convertible, Conversion Ratio														17.958
Interest Expense	3,943,000	3,797,000
Long-term Debt, Fair Value	$ 237,800,000		$ 234,000,000