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Earnings (Loss) Per Share (Details 2) - $ / shares shares in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Aug. 16, 2013	Jun. 29, 2009
Anti-dilutive shares excluded from calculation of earnings per share
Dilutive Potential Securities Excluded from Computation of EPS Amount Due to Loss			3.3
Options
Anti-dilutive shares excluded from calculation of earnings per share
Anti-dilutive shares excluded from calculation of earnings per share	2.5	5.6	7.3
Convertible notes | 5% Convertible Senior Notes due 2014
Dilutive potential shares excluded from calculation of earnings per share (in shares) due to the loss position
Stated Interest rate (as a percent)					5.00%
Initial conversion price of notes (in dollars per share)					$ 19.31
Convertible notes | 1.125% Convertible Senior Notes due 2018
Dilutive potential shares excluded from calculation of earnings per share (in shares) due to the loss position
Stated Interest rate (as a percent)	1.125%			1.125%
Initial conversion price of notes (in dollars per share)				$ 12.07

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Dilutive potential shares excluded from calculation of EPS (in shares) due to the Company's loss position during the reporting period. (type: per Share)

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Diluted Earnings Per Share
-URI http://asc.fasb.org/extlink&oid=6510752

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Contingent Stock Agreement
-URI http://asc.fasb.org/extlink&oid=6508534

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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The price per share of the conversion feature embedded in the debt instrument.

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-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
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Contractual interest rate for funds borrowed, under the debt agreement.

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-Name Accounting Standards Codification
-Topic 210
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-Section S99
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