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Warrants (Summary of Warrant Activity) (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Warrants Summary Of Warrant Activity Details |  |  |
Warrants, Outstanding as of beginning of period | 6,526,000 | 8,091,000 | 5,131,000
Granted with exercise price less than intrinsic value | 0 | 0 | 2,216,000
Granted with exercise price greater than intrinsic value | 0 | 2,148,000 | 1,855,000
Exercised | (1,487,000) | (3,713,000) | (358,000)
Canceled/expired | 0 | 0 | (753,000)
Warrants, Outstanding as of end of period | 5,039,000 | 6,526,000 | 8,091,000
Warrants, Weighted-Average Exercise Prices, Outstanding as of beginnig of period | $ 3.08 | $ 3.07 | $ 7.28
Warrants, Weighted-Average Exercise Prices, Granted less than intrinsic value | 0 | 0 | 2.71
Warrants, Weighted-Average Exercise Prices, Granted greater than intrinsic value | $ 0 | $ 2.47 | $ 2.44
Warrants, Weighted-Average Exercise Prices, Exercised | 2.19 | 2.67 | 1.77
Warrants, Weighted-Average Exercise Prices, cancelled or expired | $ 0 | $ 0 | $ 28.80
Warrants, Weighted-Average Exercise Prices, Outstanding as of end of period | $ 3.34 | $ 3.08 | $ 3.07
Warrants, Exercisable at end of period | 5,039,000 |  |
Warrants, Weighted-Average Exercise Price, Exercisable | $ 3.34 |  |

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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