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Stock-based Compensation (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 12, 2019
shares
Feb. 13, 2018
shares
Feb. 14, 2017
shares
Feb. 14, 2017
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
Plan
shares
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
Plan
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2014
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Number of plans | Plan         2     2      
Stock-based compensation, net of awards issued (shares)               220,417      
Number of additional shares authorized (shares)                     1,100,000
Stock-based compensation | $           $ 7,200,000 $ 9,900,000 $ 20,879,000 $ 34,194,000 $ 22,942,000  
Granted (shares)               389,132      
Executive Management [Member]                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Stock-based compensation | $               $ 7,200,000 9,900,000    
Total Restricted Stock Award [Member] | Restricted Stock Units (RSUs) [Member]                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Number of Common Shares to be Issued Upon Exercise of Outstanding Options, Warrants and Rights         670,183     670,183      
Number of Common Shares Remaining Available for Future Issuance Under Equity Compensation Plans         1,116,533     1,116,533      
Total Restricted Stock Award [Member] | Restricted Stock Units (RSUs) [Member] | Director Stock Award Program [Member]                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Number of shares available for grant (shares)         644,509     644,509      
Total Restricted Stock Award [Member] | Restricted Stock Units (RSUs) [Member] | Director Stock Award Program [Member] | Equity Compensation Plans Approved By Our Shareholders [Member]                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Number of Common Shares to be Issued Upon Exercise of Outstanding Options, Warrants and Rights         10,885     10,885      
Number of Common Shares Remaining Available for Future Issuance Under Equity Compensation Plans         644,509     644,509      
Total Restricted Stock Award [Member] | Restricted Stock Units (RSUs) [Member] | Employee Stock Award Program [Member]                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Number of shares available for grant (shares)         472,024     472,024      
Total Restricted Stock Award [Member] | Restricted Stock Units (RSUs) [Member] | Employee Stock Award Program [Member] | Equity Compensation Plans Approved By Our Shareholders [Member]                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Number of Common Shares to be Issued Upon Exercise of Outstanding Options, Warrants and Rights         659,298     659,298      
Number of Common Shares Remaining Available for Future Issuance Under Equity Compensation Plans         472,024     472,024      
Performance Share Award Program [Member] | Restricted Stock Units (RSUs) [Member] | Employee Stock Award Program [Member]                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Stock-based compensation | $               $ 7,200,000 9,900,000    
Performance Share Award Program [Member] | Restricted Stock Units (RSUs) [Member] | Employee Stock Award Program [Member] | Performance Share Award Program 2017 Grant [Member]                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Stock-based compensation | $         $ 13,700,000     $ 300,000 8,700,000 4,700,000  
Granted (shares)     128,112                
Award vesting period               3 years      
Options, outstanding, number (shares)         123,312     123,312      
Options, previously forfeited, number (shares)               4,800      
Shares, issued (shares)         43,136     43,136      
Stock comp shares surrendered, value | $       $ 1,600,000              
Stock comp shares surrendered, per share price (USD per share) | $ / shares       $ 37.67              
Performance Share Award Program [Member] | Restricted Stock Units (RSUs) [Member] | Employee Stock Award Program [Member] | Performance Share Award Program 2018 Grant [Member]                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Granted (shares)   162,772                  
Award vesting period               3 years      
Allocated share-based compensation expense, net of tax | $               $ 16,000.0      
Allocated share-based compensation expense | $               $ 3,000.0 11,400    
Compensation cost not yet recognized, period for recognition               12 months      
Performance Share Award Program [Member] | Restricted Stock Units (RSUs) [Member] | Employee Stock Award Program [Member] | Performance Share Award Program 2019 Grant [Member]                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Granted (shares) 220,065                    
Award vesting period               3 years      
Allocated share-based compensation expense, net of tax | $               $ 13,100      
Allocated share-based compensation expense | $               $ 8,800      
Compensation cost not yet recognized, period for recognition               24 months      
Restricted Share Award Program [Member] | Restricted Stock Units (RSUs) [Member] | Director Stock Award Program [Member]                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Stock-based compensation | $               $ 800,000 $ 1,400,000 $ 1,500,000  
Granted (shares)               10,885 8,322 9,093  
Award vesting period               1 year 1 year 3 years  
Compensation cost not yet recognized, period for recognition               3 months      
Compensation cost not yet recognized | $         $ 200,000     $ 200,000      
Grants, fair value | $               700,000 $ 900,000 $ 1,000,000.0  
Restricted Share Award Program [Member] | Restricted Stock Units (RSUs) [Member] | Employee Stock Award Program [Member]                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Stock-based compensation | $               $ 8,000,000.0 $ 8,900,000 $ 9,000,000.0  
Granted (shares)               182,533 115,618 101,811  
Award vesting period               6 years      
Compensation cost not yet recognized, period for recognition               45 months      
Compensation cost not yet recognized | $         $ 24,900,000     $ 24,900,000      
Grants, fair value | $               8,700,000 $ 11,600,000 $ 9,500,000  
Vested in period, intrinsic value | $               $ 8,700,000 $ 9,000,000.0 $ 9,600,000  
Maximum [Member] | Total Restricted Stock Award [Member] | Restricted Stock Units (RSUs) [Member] | Director Stock Award Program [Member]                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Number of shares authorized (shares)                     11,900,000
Number of shares available for grant (shares)         1,400,000     1,400,000