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Share-Based Compensation (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized 21,100,000    
Compensation cost capitalized $ 1,000,000 $ 1,100,000 $ 1,200,000
Bonus Shares and Plans      
Common shares reserved for future issuance 4,653,912 5,049,687 5,264,285
ESPP      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized 750,000    
Share-based compensation expense $ 87,502 $ 80,000 $ 122,000
Bonus Shares and Plans      
Maximum percent of salary contributed 10.00%    
Discount on market value of shares 15.00%    
Shares issued 7,475 10,410 11,022
Stock Options | Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option term 10 years    
Vesting period 3 years    
Share-based compensation expense $ 12,000 $ 73,000 $ 165,000
Weighted average fair value of options granted (USD per share) $ 0   $ 0
Options granted in period (in shares) 0    
Exercise price for options outstanding lower limit (USD per share) $ 20.32    
Exercise price for options outstanding upper limit (USD per share) $ 39.59    
Weighted average remaining contractual life of options exercisable 4 years    
Weighted average remaining contractual life of options outstanding 4 years 8 days    
Total intrinsic value of options exercised $ 1,400,000 1,400,000 $ 3,500,000
Number of options outstanding and exercisable that had an exercise price lower than the Company's share price 1,400,000    
Aggregate intrinsic value of options $ 9,600,000    
Total cash received from the exercise of options 5,000,000 6,700,000 14,400,000
Unrecognized compensation costs related to nonvested options $ 0    
Stock Options | First Portion | Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percent 20.00%    
Stock Options | Second Portion | Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percent 50.00%    
Stock Options | Third Portion | Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percent 100.00%    
Restricted Stock | Long Term Incentive Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 11,100,000 $ 11,300,000 $ 12,200,000
Shares granted 343,000    
Compensation costs not yet recognized, period for recognition 1 year 1 month 27 days    
Long Term Incentive Shares      
Granted (USD per share) $ 39.89 $ 39.93 $ 32.48
Total unrecognized compensation cost related to nonvested shares $ 8,400,000    
Total fair value of restricted shares vested $ 10,600,000 $ 11,700,000 $ 9,000,000
Restricted Stock | Long Term Incentive Shares | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Restricted Stock | Long Term Incentive Shares | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 5 years    
Restricted Stock Units (RSUs) | First Portion | 2008 plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Restricted Stock Units (RSUs) | First Portion | 2008 plan | 2017 Grant      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Restricted Stock Units (RSUs) | First Portion | 2008 plan | 2016 Grant      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Bonus Shares | Bonus Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 1,700,000 $ 2,000,000 $ 4,700,000
Shares granted 41,620 51,416 140,376
Bonus Shares | Bonus Shares | Minimum      
Bonus Shares and Plans      
Percent of bonuses taken in cash 100.00%    
Bonus Shares | Bonus Shares | Maximum      
Bonus Shares and Plans      
Percent of bonuses taken in cash 120.00%    
Salaries, Wages and Officers' Compensation $ 50,000    
Performance Shares | Profit Sharing Plan      
Bonus Shares and Plans      
Maximum percent of salary contributed 5.00%    
Profit sharing plan expense $ 706,000 $ 730,000 $ 669,000
Chief Executive Officer | Restricted Stock Units (RSUs) | 2008 plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Chief Executive Officer | Restricted Stock Units (RSUs) | 2008 plan | Maximum | 2018 Grant      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percent 250.00%    
Chief Executive Officer | Restricted Stock Units (RSUs) | 2008 plan | Maximum | 2017 Grant      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percent 272.00%    
Chief Executive Officer | Restricted Stock Units (RSUs) | 2008 plan | Maximum | 2016 Grant      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percent 272.00%    
Chief Executive Officer | Restricted Stock Units (RSUs) | First Portion | 2008 plan | 2018 Grant      
Long Term Incentive Shares      
Monte Carlo RSU Valuation 149.00%    
Chief Executive Officer | Restricted Stock Units (RSUs) | First Portion | 2008 plan | 2017 Grant      
Long Term Incentive Shares      
Monte Carlo RSU Valuation   132.00%  
Chief Executive Officer | Restricted Stock Units (RSUs) | First Portion | 2008 plan | 2016 Grant      
Long Term Incentive Shares      
Monte Carlo RSU Valuation     174.00%
Executives Other | Restricted Stock Units (RSUs) | 2008 plan | 2018 Grant      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Executives Other | Restricted Stock Units (RSUs) | 2008 plan | Maximum | 2018 Grant      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percent 200.00%    
Executives Other | Restricted Stock Units (RSUs) | 2008 plan | Maximum | 2017 Grant      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percent 200.00%    
Executives Other | Restricted Stock Units (RSUs) | 2008 plan | Maximum | 2016 Grant      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percent 200.00%    
Executives Other | Restricted Stock Units (RSUs) | First Portion | 2008 plan | 2018 Grant      
Long Term Incentive Shares      
Monte Carlo RSU Valuation 125.00%    
Executives Other | Restricted Stock Units (RSUs) | First Portion | 2008 plan | 2017 Grant      
Long Term Incentive Shares      
Monte Carlo RSU Valuation   105.00%  
Executives Other | Restricted Stock Units (RSUs) | First Portion | 2008 plan | 2016 Grant      
Long Term Incentive Shares      
Monte Carlo RSU Valuation     136.00%
Chief Financial Officer | Restricted Stock Units (RSUs) | First Portion | 2008 plan | 2016 Grant      
Long Term Incentive Shares      
Monte Carlo RSU Valuation 160.00%    
Chief Financial Officer | Restricted Stock Units (RSUs) | First Portion | 2016 Grant      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Chief Financial Officer | Restricted Stock Units (RSUs) | Second Portion | 2017 Grant      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Chief Financial Officer | Restricted Stock Units (RSUs) | Second Portion | 2016 Grant      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years