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Stock Incentive Plans (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Stock Incentive Plans          
Stock-based compensation expense, net of taxes $ 314 $ 1,300 $ 1,300 $ 2,300  
Stock-based compensation expense, taxes $ 213 $ 1,000 $ 852 $ 1,600  
Restricted common stock          
Stock Incentive Plans          
Granted (in shares)     685,872    
Outstanding (in shares) 958,759   958,759   374,817
Restricted common stock | 2014 Employee Stock Plan          
Stock Incentive Plans          
Granted (in shares)     663,960    
Outstanding (in shares) 661,290   661,290    
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 $ 12,200   $ 12,200    
Pre-tax compensation cost, weighted average recognition period     2 years 2 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 $ 5,900   $ 5,900    
Performance-based restricted stock units          
Stock Incentive Plans          
Granted (in shares)     0    
Outstanding (in shares) 744,000   744,000   751,500
Restricted shares or units for which compensation cost will be excluded until the achievement of the performance conditions become probable 471,050   471,050