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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. 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 ($) executive_officer shares	Dec. 18, 2015 USD ($) executive_officer shares	Jul. 31, 2012	Mar. 31, 2017 USD ($) executive_officer shares	Mar. 31, 2016 USD ($) executive_officer shares	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($) Awards shares	Dec. 31, 2015 USD ($) 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]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized \| shares															25,535	63,690	96,977
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															$ 800,000	$ 1,200,000	$ 900,000
2015 Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorization of common shares to issue \| shares															3,500,000
Common shares issued, net of forfeitures \| shares															1,438,228	1,024,739
Number of shares authorized \| shares															2,061,772	2,475,261
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																	1,878,637
Granted in period (in shares) \| shares															413,489	885,219	251,789
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	$ 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	$ 1,000,000
Shares issued under the plan \| shares															23,231	21,374	23,201
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															$ 9,800,000	$ 7,400,000	$ 5,900,000
Withheld of common stock \| shares															94,403	48,248	49,225
Stock Incentive Plan [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of performance based awards released								$ 1,300,000	$ 1,300,000
Shares issued under the plan \| shares								41,368	44,162
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								5	5
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								4	4
Stock Incentive Plan [Member] \| Performance Shares [Member] \| Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense															$ 1,100,000	$ 0	$ 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															$ 5,000,000	4,000,000	2,700,000
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] \| 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]
Granted in period					$ 4,700,000
Granted in period (in shares) \| shares					163,788
Executive Incentive Plan [Member] \| 2015 Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period						3 years
Granted in period						$ 3,900,000
Granted in period (in shares) \| shares						139,000
Executive Incentive Plan [Member] \| 2015 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] \| 2015 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] \| 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															$ 1,200,000	$ 1,200,000	$ 1,100,000
Shares issued under the plan \| shares															39,016	42,256	55,923
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															1,000,000
401(k) Plan [Abstract]
Total DRIP shares issued under the Plan \| shares															581,627
Total shares issued under the Dividend Reinvestment Plan \| shares															26,031	9,575	13,950
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] \| 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	$ 2,000,000
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	1,100,000
Scenario, Forecast [Member] \| Executive Incentive Plan [Member] \| 2015 Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense														1,300,000
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	$ 1,300,000