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Stock Incentive Plans (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Stock Incentive Plans      
Stock-based compensation expense, net of taxes $ 942 $ 995  
Stock-based compensation expense, taxes $ 639 $ 614  
Restricted common stock      
Stock Incentive Plans      
Granted (in shares) 685,872    
Outstanding (in shares) 1,026,949   374,817
Restricted common stock | 2014 Employee Stock Plan      
Stock Incentive Plans      
Granted (in shares) 663,960    
Outstanding (in shares) 663,510    
Vesting percentage 33.34%    
Restricted common stock | 2007 Non-Employee Directors Stock Plan      
Stock Incentive Plans      
Granted (in shares) 21,912    
Restricted common stock | 2007 Non-Employee Directors Stock Plan | Shares Vesting in February 2018      
Stock Incentive Plans      
Vesting percentage 100.00%    
Restricted common stock and restricted stock units      
Stock Incentive Plans      
Pre-tax compensation cost related to share-based compensation awards not yet recognized $ 15,000    
Pre-tax compensation cost, weighted average recognition period 2 years 3 months    
Performance-based restricted common stock and performance-based restricted stock units      
Stock Incentive Plans      
Pre-tax compensation cost related to non-vested performance-based stock awards and units $ 4,400    
Performance-based restricted common stock      
Stock Incentive Plans      
Restricted shares or units for which compensation cost will be excluded until the achievement of the performance conditions become probable 65,000    
Performance-based restricted stock units      
Stock Incentive Plans      
Granted (in shares) 0    
Outstanding (in shares) 746,000   751,500
Restricted shares or units for which compensation cost will be excluded until the achievement of the performance conditions become probable 285,800