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Stock Incentive Plans - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Stock Incentive Plans    
Stock-based compensation expense, net of taxes $ 1,000 $ 942
Stock-based compensation expense, taxes $ 697 $ 639
Restricted common stock    
Stock Incentive Plans    
Restricted common stock granted (in shares) 521,784  
Pre-tax compensation cost related to all unvested awards not yet recognized $ 17,400  
Pre-tax compensation cost, weighted average period of recognition 2 years 2 months  
Pre-tax compensation cost excluded $ 2,400  
Restricted common stock | 2014 Employee Stock Plan    
Stock Incentive Plans    
Restricted common stock granted (in shares) 504,252  
Vesting percentage 33.33%  
Restricted common stock | 2007 Non-Employee Directors Stock Plan    
Stock Incentive Plans    
Restricted common stock granted (in shares) 17,532  
Restricted common stock | 2007 Non-Employee Directors Stock Plan | Shares vesting in January 2020    
Stock Incentive Plans    
Vesting percentage 100.00%  
Performance-based restricted stock units    
Stock Incentive Plans    
Performance-based restricted stock units granted for which compensation cost will be excluded (in shares) 188,400