Debt and Subordinated Convertible Debentures (Narrative) (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended
	Nov. 30, 2009	Mar. 31, 2014
Debt Instrument
Stated interest rate		4.00%
Convertible subordinated notes—4 percent
Debt Instrument
Face amount	$ 173,000,000	$ 100,000,000
Stated interest rate		4.00%
Hedge transactions cost	26,000,000
Hedge transactions cost decreased APIC	17,000,000
Convertible note hedge transactions shares (in shares)		8.7
Effective conversion price (in dollars per share)		$ 15.56
Percentage premium over price at issuance		75.00%
Closing price at issuance (in dollars per share)		$ 8.89
ABL Facility
Debt Instrument
Maximum revolving credit amount percentage		10.00%
Debt terms reference amount to maximum revolving credit		$ 150,000,000
Minimum | Convertible subordinated notes—4 percent
Debt Instrument
Market price per share (in dollars per share)		$ 90
Convertible equity shares (in shares)		7.5
Maximum | Convertible subordinated notes—4 percent
Debt Instrument
Market price per share (in dollars per share)		$ 95
Convertible equity shares (in shares)		7.6