Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Earnings Per Share Additional Information (Details) (USD $)	1 Months Ended	3 Months Ended
	May 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Apr. 24, 2014	Dec. 31, 2013	Nov. 27, 2012	Dec. 16, 2013	Jun. 24, 2013	Mar. 05, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock repurchase program, amount authorized				$ 50,000,000.0
Stock repurchased during period (shares)	400,000
Stock repurchased during period (value)	16,800,000
Anti-dilutive securities, employee stock options excluded from EPS		0	0
2017 Convertible Senior Notes [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt component		115,000,000
Conversion price (in dollars per share)		31.56				$ 31.56
Warrants sold to purchase common stock (in shares)					3,600,000
2017 Convertible Senior Notes [Member] \| Before Amendment [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Warrants exercise price (in dollars per share)					44.19
2017 Convertible Senior Notes [Member] \| After Amendment [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Warrants exercise price (in dollars per share)							$ 60.00
2017 Convertible Senior Notes [Member] \| Adjusted Debt Conversion Rate Following Hedge Transactions [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Conversion price (in dollars per share)		60.00
2020 Convertible Senior Notes [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt component		172,500,000
Conversion price (in dollars per share)		45.72						$ 45.72
2020 Convertible Senior Notes [Member] \| Adjusted Debt Conversion Rate Following Hedge Transactions [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Conversion price (in dollars per share)		61.55
2021 Convertible Senior Notes [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt component		161,000,000
Conversion price (in dollars per share)		59.39							$ 59.39