Net Income (Loss) Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Basic EPS
Net income (loss) available to common stockholders	$ (33,287)us-gaap_NetIncomeLoss	$ (37,191)us-gaap_NetIncomeLoss
Weighted average shares
Basic (in shares)	102,580,000	102,365,000
Diluted (in shares)	102,580,000	102,365,000
Income (loss) per share
Basic	$ (0.32)us-gaap_EarningsPerShareBasic	$ (0.36)us-gaap_EarningsPerShareBasic
Diluted	$ (0.32)us-gaap_EarningsPerShareDiluted	$ (0.36)us-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	1,302,777	2,071,279

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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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