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Warrants (Schedule of Warrant Activity) (Details)
shares in Thousands
 6 Months Ended
Jun. 30, 2017
shares
Class of Warrant or Right, Outstanding [Roll Forward]  
Warrants outstanding , Beginning balance 2,570
Granted 17,000
Exercised 0
Class of Warrant or Right, Expired (13)
Warrants outstanding , Ending balance 19,557
February 2017  
Class of Warrant or Right, Outstanding [Roll Forward]  
Warrants outstanding , Beginning balance 0
Granted 17,000
Exercised 0
Class of Warrant or Right, Expired 0
Warrants outstanding , Ending balance 17,000
July 2016  
Class of Warrant or Right, Outstanding [Roll Forward]  
Warrants outstanding , Beginning balance 700
Granted 0
Exercised 0
Class of Warrant or Right, Expired 0
Warrants outstanding , Ending balance 700
January 2016  
Class of Warrant or Right, Outstanding [Roll Forward]  
Warrants outstanding , Beginning balance 682
Granted 0
Exercised 0
Class of Warrant or Right, Expired 0
Warrants outstanding , Ending balance 682
March 2015  
Class of Warrant or Right, Outstanding [Roll Forward]  
Warrants outstanding , Beginning balance 700
Granted 0
Exercised 0
Class of Warrant or Right, Expired 0
Warrants outstanding , Ending balance 700
September 2013  
Class of Warrant or Right, Outstanding [Roll Forward]  
Warrants outstanding , Beginning balance 199
Granted 0
Exercised 0
Class of Warrant or Right, Expired 0
Warrants outstanding , Ending balance 199
December 2012  
Class of Warrant or Right, Outstanding [Roll Forward]  
Warrants outstanding , Beginning balance 152
Granted 0
Exercised 0
Class of Warrant or Right, Expired 0
Warrants outstanding , Ending balance 152
April 2011  
Class of Warrant or Right, Outstanding [Roll Forward]  
Warrants outstanding , Beginning balance 13
Granted 0
Exercised 0
Class of Warrant or Right, Expired (13)
Warrants outstanding , Ending balance 0
Other  
Class of Warrant or Right, Outstanding [Roll Forward]  
Warrants outstanding , Beginning balance 124
Granted 0
Exercised 0
Class of Warrant or Right, Expired 0
Warrants outstanding , Ending balance 124