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Stockholders' Equity - Restricted Stock Plan (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock award, issued during period (in shares) 1,767,374      
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based payment award, number of shares authorized (in shares)       5,000,000
Share-based payment award, limitation on single participant (in shares) (no more than)       750,000
Restricted stock award, not yet vested (in shares) 283,338 224,289 197,674 184,190
Unrecognized compensation expense       $ 2.3
Unrecognized compensation expense, recognition weighted average period 2 years 2 months      
Number of Shares        
Nonvested restricted shares outstanding at beginning of year (in shares) 283,338 224,289 197,674  
Granted (in shares) 142,475 216,017 150,647  
Forfeited (in shares) (12,858) (29,150) (51,234)  
Vested (in shares) (228,765) (127,818) (72,798)  
Nonvested restricted shares outstanding at end of year (in shares) 184,190 283,338 224,289  
Weighted Average Fair Value at Date of Grant        
Nonvested restricted shares outstanding at beginning of year (in dollars per share) $ 37.26 $ 41.30 $ 43.56  
Granted (in dollars per share) 39.58 36.03 39.47  
Forfeited (in dollars per share) 40.06 42.50 43.56  
Vested (in dollars per share) 35.86 41.06 42.06  
Nonvested restricted shares outstanding at end of year (in dollars per share) $ 40.33 $ 37.26 $ 41.30  
Restricted Stock Performance Plan | Award Opportunity 2017-2018        
Number of Shares        
Granted (in shares) 91,396      
Weighted Average Fair Value at Date of Grant        
Compensation expense $ 2.0      
Restricted Stock Performance Plan | Award Opportunity 2016-2017        
Number of Shares        
Granted (in shares)   75,741    
Weighted Average Fair Value at Date of Grant        
Compensation expense $ 2.2 $ 1.7    
Restricted Stock Performance Plan | Award Opportunity 2015-2016        
Number of Shares        
Granted (in shares)     167,961  
Weighted Average Fair Value at Date of Grant        
Compensation expense   $ 2.2 $ 2.8  
Restricted Stock Performance Plan | Award Opportunity 2014-2015        
Weighted Average Fair Value at Date of Grant        
Compensation expense     $ 1.5