Related Party Transactions (Narrative) (Details) (2014 Notes [Member], USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014
Related Party Transactions [Line Items]
Conversion price	$ 10.07
Tower [Member]
Related Party Transactions [Line Items]
Aggregate amount of debt issued	$ 58.3
Conversion price	$ 10.07
Net present value per share	$ 4.5
Maturity period of advance payment on future conversion	1 year
Maximum annual extended maturity period of advance payment on future conversion	4 years
Additional annual extended maturity period of advance payment on future conversion	1 year
Tower [Member] \| Maximum [Member]
Related Party Transactions [Line Items]
Number of shares issued in conversion of debt	5.8

The additional annual extended period in which advance payment on future conversion would mature.

No definition available.

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- Definition

The net present value per each share underlying the 2014 Notes.

+ References

No definition available.

+ Details

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- Definition

The period in which advance payment on future conversion would mature.

+ References

No definition available.

+ Details

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- Definition

The maximum annual extended period in which advance payment on future conversion would mature.

+ References

No definition available.

+ Details

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- Definition

The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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Period Type:	duration

- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870

+ Details

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Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

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Balance Type:	credit
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- Details

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