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Warrants (Summary of Warrant Activity) (Details) - $ / shares shares in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Warrants Summary Of Warrant Activity Details |  |  |
Warrants, Outstanding as of beginning of period | 3,761 | 5,039 | 6,526
Granted with exercise price less than intrinsic value | 0 | 0 | 0
Granted with exercise price greater than intrinsic value | 0 | 0 | 0
Exercised | (460) | 0 | (1,487)
Canceled/expired | (1,328) | (1,278) | 0
Warrants, Outstanding as of end of period | 1,973 | 3,761 | 5,039
Warrants, Weighted-Average Exercise Prices, Outstanding as of beginnig of period | $ 2.23 | $ 3.34 | $ 3.08
Warrants, Weighted-Average Exercise Prices, Granted less than intrinsic value | 0 | 0 | 0
Warrants, Weighted-Average Exercise Prices, Granted greater than intrinsic value | 0 | 0 | 0
Warrants, Weighted-Average Exercise Prices, Exercised | 1.97 | 0 | 2.19
Warrants, Weighted-Average Exercise Prices, cancelled or expired | 1.97 | 6.24 | 0
Warrants, Weighted-Average Exercise Prices, Outstanding as of end of period | $ 2.47 | $ 2.23 | $ 3.34
Warrants, Exercisable at end of period | 1,973 |  |
Warrants, Weighted-Average Exercise Price, Exercisable | $ 2.47 |  |

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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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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + 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)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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