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Stock-Based Compensation (Summary of Activities Related to Stock Appreciation Rights) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Weighted Average Exercise Price        
Exercised $ 15.31 $ 9.37 $ 0.00  
Stock Appreciation Rights (SARs) [Member]        
Shares        
Beginning Balance 28,668 16,057 16,227  
Granted 2,899 13,071    
Exercised (165)      
Forfeited (14,852) (460) (170)  
Ending Balance 16,550 28,668 16,057 16,227
Ending Balance, Exercisable 3,847      
Weighted Average Exercise Price        
Beginning Balance $ 32.63 $ 47.58 $ 42.81  
Granted 17.39 15.31 0.00  
Exercised 24.35      
Forfeited 45.93 62.87 93.68  
Ending Balance 18.10 $ 32.63 $ 47.58 $ 42.81
Ending Balance, Exercisable $ 25.73      
Remaining average contractual term        
Remaining average contractual term 8 years 7 months 6 days 7 years 6 months 6 years 9 months 18 days 6 years 10 months 24 days
Remaining average contractual term, Exercisable 8 years 1 month 6 days      
Aggregate Intrinsic Value        
Aggregate intrinsic value $ 251 $ 6   $ 389
Aggregate intrinsic value, Exercisable $ 53