Financing Arrangements (Details) - USD ($)			3 Months Ended	6 Months Ended
	May 09, 2016	Apr. 04, 2016	Jun. 30, 2016	Jun. 30, 2016	Jun. 30, 2015
Debt Instrument [Line Items]
Interest Expense, Debt, Excluding Amortization			$ 2,031,000
Convertible Debt, Fair Value Disclosures			$ 229,900,000	$ 229,900,000
Debt Instrument, Convertible, Remaining Discount Amortization Period			5 years 9 months
Share Price			$ 3.25	$ 3.25
Payments for Derivative Instrument, Financing Activities				$ 59,163,000
Hedging Activity, Shares Covered	46,300,000
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities			46,300,000
Convertible Note Hedge, Strike Price	$ 5.40
Class of Warrant or Right, Exercise Price of Warrants or Rights			$ 8.50	$ 8.50
Debt Instrument, Face Amount			$ 250,000,000	$ 250,000,000
Debt Instrument, Unamortized Discount			(75,985,000)	(75,985,000)
Convertible Notes Payable, Noncurrent			174,015,000	174,015,000
Proceeds from Debt, Net of Issuance Costs			$ 243,200,000
Debt Instrument, Interest Rate, Stated Percentage		3.25%
Debt Conversion, Converted Instrument, Amount		$ 1,000
Debt Conversion, Converted Instrument, Shares Issued		185.1852
Debt Instrument, Convertible, Conversion Price		$ 5.40
Proceeds from Issuance of Warrants				$ 35,495,000	$ 0
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger		150.00%
Debt Instrument, Convertible, Threshold Trading Days		20
Debt Instrument, Convertible, Threshold Consecutive Trading Days		30 days
Debt Instrument, Interest Rate, Effective Percentage			9.75%	9.75%
Debt Issuance Cost			$ 6,800,000
Deferred Finance Costs, Net			4,800,000	$ 4,800,000
Amortization of Debt Discount (Premium)			2,396,000	2,396,000	$ 0
Interest Expense, Debt			4,427,000
Senior Notes [Member]
Debt Instrument [Line Items]
Convertible Debt		$ 250,000,000
Additional Paid-in Capital [Member]
Debt Instrument [Line Items]
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt				68,658,000
Transaction Costs [Member]
Debt Instrument [Line Items]
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt			$ 2,000,000
Excluding Transaction Costs [Member]
Debt Instrument [Line Items]
Payments for Derivative Instrument, Financing Activities				$ 59,100,000