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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
May 26, 2016
2007 Incentive Stock Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Contractual term (in years) 10 years      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 0 13,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price   $ 90.00    
2016 Equity Incentive Award Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares approved for grant (in shares)       1,626,855
2016 Equity Incentive Award Plan | Restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Non-cash stock based compensation $ 1.5 $ 3.4 $ 5.1  
Unearned compensation expense, restricted shares $ 1.0      
Estimated forfeiture rate, restricted shares (as a percent) 5.00%      
2016 Equity Incentive Award Plan | Restricted stock | Employees and service providers        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period (in years) 3 years      
2016 Equity Incentive Award Plan | Restricted stock | Directors        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period (in years) 1 year