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Stock Purchase Plans (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Term of service completed before eligible for coverage 1 year 1000 hours    
ESPP [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares available for issuance 250,000    
Minimum percent of fair value market option price 90.00%    
Expiration date, maximum term from grant date, in years 1 year    
Grant price, percent of the stock's fair value at the time of award 95.00%    
Compensation expense $ 0 $ 0 $ 0
Option expiration date Jul. 02, 2017    
ISOP [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares available for issuance 354,877    
Minimum percent of fair value market option price 100.00%    
Period of incentive stock option plan, in years 10 years    
Option term, in years 10 years    
Term of service completed before eligible for coverage 6 months