Net Income (Loss) Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income (loss) per share, basic
Net income (loss) available to common stockholders	$ (1,155,884)us-gaap_NetIncomeLoss	$ (650,563)us-gaap_NetIncomeLoss	$ 48,677us-gaap_NetIncomeLoss
Weighted average shares
Basic (in shares)	102,441,000	97,864,000	89,437,000
Effect of share based compensation plans (in shares)	0	0	166,000
Diluted (in shares)	102,441,000	97,864,000	89,603,000
Income (loss) per share
Basic (in dollars per share)	$ (11.28)us-gaap_EarningsPerShareBasic	$ (6.65)us-gaap_EarningsPerShareBasic	$ 0.54us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ (11.28)us-gaap_EarningsPerShareDiluted	$ (6.65)us-gaap_EarningsPerShareDiluted	$ 0.54us-gaap_EarningsPerShareDiluted
Convertible Senior Notes Due March 2028 [Member]
Earnings Per Share (Textual) [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	3.25%	3.25%
Stock Options [Member]
Earnings Per Share (Textual) [Abstract]
Number of shares of common stock equivalents related to convertible debt	1,871,681	1,111,021	479,767

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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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Contractual interest rate for funds borrowed, under the debt agreement.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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