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Stock and Other Incentive Plans (Details Textual)								3 Months Ended		12 Months Ended
Stock and Other Incentive Plans (Details Textual)	Dec. 12, 2018 USD ($) executive_officer shares	Dec. 11, 2017 USD ($) executive_officer shares	Dec. 30, 2016 USD ($) shares	Dec. 16, 2016 USD ($) executive_officer shares	Mar. 01, 2016 USD ($) shares	Feb. 16, 2016 USD ($) executive_officer shares	Jul. 31, 2012	Mar. 31, 2018 USD ($) executive_officer shares	Mar. 31, 2017 USD ($) executive_officer shares	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($) Awards shares	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Executive Incentive Plan, Cash-based Award						$ 1,100,000
401(k) Plan [Abstract]
Percentage of matching contribution															3.00%
Value of matching contribution															$ 400,000	$ 400,000	$ 400,000
Discount on market price on the date of grant															85.00%
Discount on market price on the date of exercise															85.00%
Employee Stock Purchase Plan [Member]
401(k) Plan [Abstract]
Value of shares available for grant each year															$ 25,000
Discount on market price on the date of grant															85.00%
Discount on market price on the date of exercise															85.00%
Option expiration period															27 months
Cash received from employees upon exercising options															$ 400,000	$ 800,000	$ 1,200,000
2015 Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorization of common shares to issue (shares) \| shares															3,500,000
Common shares issued, net of forfeitures (shares) \| shares															1,711,240	1,438,228
Number of shares authorized (shares) \| shares															1,788,760	2,061,772
2015 Incentive Plan [Member] \| Restricted Stock [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period															3 years
2015 Incentive Plan [Member] \| Restricted Stock [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period															8 years
Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares issued, net of forfeitures (shares) \| shares																	1,878,637
Granted in period (in shares) \| shares															273,012	413,489	885,219
Stock Incentive Plan [Member] \| Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense															$ 1,700,000	$ 1,700,000	$ 100,000
Number of one-time non-vested share grants \| Awards																	3
Stock Incentive Plan [Member] \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period															1 year			3 years
Share-based compensation expense															$ 800,000		$ 1,000,000.0
Shares issued under the plan (shares) \| shares															30,989	23,231	21,374
Stock Incentive Plan [Member] \| Chief Financial Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					10 years
Share-based compensation expense					$ 200,000
Granted in period (in shares) \| shares					50,000
Stock Incentive Plan [Member] \| President and Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			10 years
Share-based compensation expense			$ 600,000
Granted in period (in shares) \| shares			200,000
Stock Incentive Plan [Member] \| Executive Chairman [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			5 years
Share-based compensation expense			$ 900,000
Granted in period (in shares) \| shares			150,000
Stock Incentive Plan [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense															$ 10,400,000	$ 9,800,000	$ 7,400,000
Withheld of common stock (shares) \| shares															151,353	94,403	48,248
Stock Incentive Plan [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of performance based awards released								$ 1,200,000	$ 1,300,000
Shares issued under the plan (shares) \| shares								43,414	41,368
Stock Incentive Plan [Member] \| Performance Shares [Member] \| Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of executive officers granted awards \| executive_officer								4	4
Stock Incentive Plan [Member] \| Performance Shares [Member] \| Senior Vice President [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of executive officers granted awards \| executive_officer								5	5
Stock Incentive Plan [Member] \| Performance Shares [Member] \| Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense															$ 1,200,000	$ 1,100,000	$ 1,100,000
Stock Incentive Plan [Member] \| Performance Shares [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period								3 years
Stock Incentive Plan [Member] \| Performance Shares [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period								8 years
Stock Incentive Plan [Member] \| Performance Shares [Member] \| Weighted Average [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period								6 years
Stock Incentive Plan [Member] \| Restricted Stock and Performance Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average amortization period remaining															5 years 1 month 6 days
Stock Incentive Plan [Member] \| Restricted Stock and Performance Based Awards [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period															1 year
Stock Incentive Plan [Member] \| Restricted Stock and Performance Based Awards [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period															8 years
Executive Incentive Plan [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense															$ 5,700,000	5,000,000.0	4,000,000.0
Executive Incentive Plan [Member] \| Performance Shares [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shareholder return performance period used to measure award							1 year
Executive Incentive Plan [Member] \| Performance Shares [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shareholder return performance period used to measure award							3 years
Executive Incentive Plan [Member] \| 2018 Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years
Granted in period	$ 5,000,000.0
Granted in period (in shares) \| shares	165,261
Executive Incentive Plan [Member] \| 2018 Performance Shares [Member] \| Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of executive officers granted awards \| executive_officer	4
Executive Incentive Plan [Member] \| 2018 Performance Shares [Member] \| Senior Vice President [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of executive officers granted awards \| executive_officer	5
Executive Incentive Plan [Member] \| 2017 Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		5 years
Granted in period		$ 10,100,000
Granted in period (in shares) \| shares		309,874
Executive Incentive Plan [Member] \| 2017 Performance Shares [Member] \| Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of executive officers granted awards \| executive_officer		5
Executive Incentive Plan [Member] \| 2017 Performance Shares [Member] \| Senior Vice President [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of executive officers granted awards \| executive_officer		4
Executive Incentive Plan [Member] \| February 2016 Cash Incentive and Performance-based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted in period						$ 5,800,000
Executive Incentive Plan [Member] \| February 2016 Cash Incentive and Performance-based Awards [Member] \| Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of executive officers granted awards \| executive_officer						5
Executive Incentive Plan [Member] \| February 2016 Cash Incentive and Performance-based Awards [Member] \| Senior Vice President [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of executive officers granted awards \| executive_officer						5
Executive Incentive Plan [Member] \| February 2016 Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense															1,100,000
Granted in period						$ 4,700,000
Granted in period (in shares) \| shares						163,788
Executive Incentive Plan [Member] \| 2016 Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				5 years
Granted in period				$ 6,300,000
Granted in period (in shares) \| shares				213,639
Executive Incentive Plan [Member] \| 2016 Performance Shares [Member] \| Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of executive officers granted awards \| executive_officer				5
Executive Incentive Plan [Member] \| 2016 Performance Shares [Member] \| Senior Vice President [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of executive officers granted awards \| executive_officer				5
Salary Deferral Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense															$ 1,000,000.0	$ 1,200,000	$ 1,200,000
Shares issued under the plan (shares) \| shares															33,348	39,016	42,256
Maximum salary deferral for officers under the plan, percent															50.00%
Dividend Reinvestment Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorization of common shares to issue (shares) \| shares															1,000,000
401(k) Plan [Abstract]
Total DRIP shares issued under the Plan (shares) \| shares															591,114
Total shares issued under the Dividend Reinvestment Plan (shares) \| shares															9,487	26,031	9,575
3-year Vesting [Member] \| Executive Incentive Plan [Member] \| February 2016 Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period						3 years
5-year Vesting [Member] \| Executive Incentive Plan [Member] \| February 2016 Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period						5 years
Deferral Option One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Salary Deferral Plan employer matching contribution, percent															30.00%
Deferral Option One [Member] \| Salary Deferral Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period															3 years
Deferral Option Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Salary Deferral Plan employer matching contribution, percent															50.00%
Deferral Option Two [Member] \| Salary Deferral Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period															5 years
Deferral Option Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Salary Deferral Plan employer matching contribution, percent															100.00%
Deferral Option Three [Member] \| Salary Deferral Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period															8 years
Scenario, Forecast [Member] \| Executive Incentive Plan [Member] \| 2018 Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense										$ 900,000	$ 1,000,000	$ 1,000,000	$ 1,000,000	$ 1,000,000.0
Scenario, Forecast [Member] \| Executive Incentive Plan [Member] \| 2017 Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense											$ 1,900,000	2,000,000	2,000,000	2,000,000.0
Scenario, Forecast [Member] \| Executive Incentive Plan [Member] \| February 2016 Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense													700,000	700,000
Scenario, Forecast [Member] \| Executive Incentive Plan [Member] \| 2016 Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense												$ 1,200,000	$ 1,300,000	$ 1,300,000