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Stock Incentive Plans (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Stock Incentive Plans          
Stock-based compensation expense, net of taxes $ 1,500 $ 1,400 $ 3,800 $ 4,200  
Stock-based compensation expense, taxes $ 969 $ 789 $ 2,600 $ 2,300  
Restricted common stock          
Stock Incentive Plans          
Granted (in shares)     429,752    
Outstanding (in shares) 1,079,737   1,079,737   752,701
Performance-based restricted stock units          
Stock Incentive Plans          
Granted (in shares)     409,800    
Outstanding (in shares) 1,120,500   1,120,500   776,500
Restricted shares or units for which compensation cost will be excluded until the achievement of the performance conditions become probable 289,075   289,075    
Performance-based restricted stock units | Shares Vesting in February 2018          
Stock Incentive Plans          
Shares to be issued as a percentage of units granted in the event of change in control     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 $ 11,300   $ 11,300    
Pre-tax compensation cost, weighted average recognition period     1 year 10 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 $ 4,500   $ 4,500    
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   65,000    
Employee Stock Plan, 2014 Plan | Restricted common stock          
Stock Incentive Plans          
Granted (in shares)     401,520    
Outstanding (in shares) 394,470   394,470    
Vesting percentage     33.00%    
Employee Stock Plan, 2014 Plan | Performance-based restricted stock units          
Stock Incentive Plans          
Granted (in shares)     409,800    
Outstanding (in shares) 402,200   402,200    
Share of common stock to be paid for each restricted stock unit     1    
Directors Stock Plan, 2007 Plan | Restricted common stock          
Stock Incentive Plans          
Granted (in shares)     28,232    
Directors Stock Plan, 2007 Plan | Restricted common stock | Shares Vesting in February 2018          
Stock Incentive Plans          
Outstanding (in shares) 23,860   23,860    
Vesting percentage     100.00%    
Minimum | Performance-based restricted stock units | Shares Vesting in February 2018          
Stock Incentive Plans          
Shares to be issued on vest date as percentage of units granted based on actual performance     0.00%    
Maximum | Performance-based restricted stock units | Shares Vesting in February 2018          
Stock Incentive Plans          
Shares to be issued on vest date as percentage of units granted based on actual performance     125.00%