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Stock-Based Compensation (Schedule of Other Information) (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted-average fair value of options granted (per share) $ 3.20 $ 4.53
Intrinsic value gain of options exercised $ 0 $ 0
Cash receipts from exercise of options $ 0 $ 0