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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity.

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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. 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 ($) executive_officer shares	Jul. 31, 2012	Mar. 31, 2016 USD ($) executive_officer shares	Mar. 31, 2015 USD ($) executive_officer shares	Mar. 31, 2014 executive_officer shares	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 USD ($) shares	Dec. 31, 2014 USD ($) executive_officer shares
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%
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															1,024,739	139,520
Number of shares authorized \| shares															2,475,261
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	1,816,580
Number of shares authorized \| shares																3,360,480
Granted in period (in shares) \| shares															885,219	251,789	269,129
Stock Incentive Plan [Member] \| Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense															$ 100,000
Stock Incentive Plan [Member] \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period																3 years
Share-based compensation expense															$ 1,000,000	$ 1,000,000	$ 500,000
Shares issued under the plan \| shares															21,374	23,201	26,677
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															$ 7,400,000	$ 5,900,000	$ 4,100,000
Withheld of common stock \| shares															48,428	49,225	371,017
Stock Incentive Plan [Member] \| Restricted Stock [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period															3 years
Stock 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] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of performance based awards released							$ 1,300,000	$ 1,000,000
Shares issued under the plan \| shares							44,162	33,145
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							5	5
Stock Incentive Plan [Member] \| Performance Shares [Member] \| Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period									8 years
Share-based compensation expense															$ 500,000	$ 300,000	$ 100,000
Number of executive officers granted awards \| executive_officer									3
Shares issued under the plan \| shares									2,968
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 10 months 24 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															10 years
Executive Incentive Plan [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense															$ 2,600,000	2,500,000	$ 1,300,000
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] \| 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] \| 2014 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																	140,930
Executive Incentive Plan [Member] \| 2014 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] \| 2014 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															$ 1,100,000	$ 1,100,000	$ 1,700,000
Shares issued under the plan \| shares															42,256	55,923	71,460
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															555,596
Total shares issued under the Dividend Reinvestment Plan \| shares															9,575	13,950	12,606
Employees Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized \| shares															63,690	96,977	88,495
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															$ 1,200,000	$ 900,000	$ 1,200,000
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] \| 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	$ 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	1,300,000
Scenario, Forecast [Member] \| Executive Incentive Plan [Member] \| 2014 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	$ 1,300,000