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Pay vs Performance Disclosure
pure in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Pay vs Performance Disclosure [Table]      
Pay vs Performance [Table Text Block]
Pay Versus Performance
Pay Versus Performance Table
The following table sets forth additional compensation information for our CEO and our other Named Executives (Other NEOs) (averaged) along with total shareholder return, net income, and Adjusted EBITDA performance results for fiscal 2022, 2021 and 2020.
​
Year
​ ​
Summary
Comp.
Table
Total for
H. Chris
Killingstad
($)(1)
​ ​
Summary
Comp.
Table
Total for
David W.
Huml
($)(1)
​ ​
Comp.
Actually
Paid to
H. Chris
Killingstad
($)(1)(2)
​ ​
Comp.
Actually
Paid to
David W.
Huml
($)(1)(2)
​ ​
Average
Summary
Comp.
Table
Total for
Non-CEO
NEOs
($)(1)
​ ​
Average
Comp.
Actually
Paid to
Non-CEO
NEOs
($)(1)(2)
​ ​
Year-end value of $100
invested on 12/31/2019 in:
​ ​
Net
Income
(in millions)
($)
​ ​
Adjusted
EBITDA
(in millions)
($)(4)
​
​
Tennant
Company
($)
​ ​
S&P 500
Industrials
(Sector)
(TR)
($)(3)
​
​
2022
​ ​ ​ ​ — ​ ​ ​ ​ ​ 4,104,579 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 2,122,227 ​ ​ ​ ​ ​ 1,294,266 ​ ​ ​ ​ ​ 698,603 ​ ​ ​ ​ ​ 82.27 ​ ​ ​ ​ ​ 127.15 ​ ​ ​ ​ ​ 66.3 ​ ​ ​ ​ ​ 133.7 ​ ​
​
2021
​ ​ ​ ​ 2,709,314 ​ ​ ​ ​ ​ 4,303,328 ​ ​ ​ ​ ​ 4,658,162 ​ ​ ​ ​ ​ 4,921,346 ​ ​ ​ ​ ​ 1,375,494 ​ ​ ​ ​ ​ 1,482,689 ​ ​ ​ ​ ​ 106.64 ​ ​ ​ ​ ​ 134.52 ​ ​ ​ ​ ​ 64.9 ​ ​ ​ ​ ​ 140.2 ​ ​
​
2020
​ ​ ​ ​ 4,245,227 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 405,184 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 1,199,543 ​ ​ ​ ​ ​ 202,581 ​ ​ ​ ​ ​ 91.24 ​ ​ ​ ​ ​ 111.06 ​ ​ ​ ​ ​ 33.7 ​ ​ ​ ​ ​ 119.4 ​ ​
​
(1)
For 2022, the CEO was Mr. Huml (Current CEO) and the Other NEOs were Fay West, Richard H. Zay, Carol E. McKnight, and Kristin A. Erickson.
​
For 2021, the CEO was H. Chris Killingstad (Prior CEO) until February 28, 2021, and then David W. Huml became CEO March 1, 2021, and the Other NEOs were Fay West, Richard H. Zay, Carol E. McKnight, Daniel E. Glusick, Thomas Paulson, and Andrew Cebulla.
For 2020, the CEO was H. Chris Killingstad and the Other NEOs were David W. Huml, Richard H. Zay, Carol E. McKnight, Andrew Cebulla, Keith A. Woodward, and Mary E. Talbott.
(2)
Compensation actually paid was determined by making the following adjustments for equity awards:
​
​ ​ ​ ​
2022
​ ​
2021
​ ​
2020
​
​ ​ ​ ​
Current
CEO
($)
​ ​
Average
of Other
NEOs
($)
​ ​
Current
CEO
($)
​ ​
Prior
CEO
($)
​ ​
Average
of Other
NEOs
($)
​ ​
CEO
($)
​ ​
Average
of Other
NEOs
($)
​
​ Total Compensation from
SCT 		​ ​ ​ ​ 4,104,579 ​ ​ ​ ​ ​ 1,294,266 ​ ​ ​ ​ ​ 4,303,328 ​ ​ ​ ​ ​ 2,709,314 ​ ​ ​ ​ ​ 1,375,494 ​ ​ ​ ​ ​ 4,245,227 ​ ​ ​ ​ ​ 1,199,543 ​ ​
​ Subtraction: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​
SCT Amounts
​ ​ ​ ​ 2,650,500 ​ ​ ​ ​ ​ 637,600 ​ ​ ​ ​ ​ 2,597,509 ​ ​ ​ ​ ​ 1,732,302 ​ ​ ​ ​ ​ 674,364 ​ ​ ​ ​ ​ 2,687,909 ​ ​ ​ ​ ​ 505,947 ​ ​
​ Adjustments: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​
Addition: Fair value at year-end of awards granted during the covered fiscal year that are outstanding and unvested at year-end
​ ​ ​ ​ 1,800,678 ​ ​ ​ ​ ​ 433,167 ​ ​ ​ ​ ​ 2,374,029 ​ ​ ​ ​ ​ 880,417 ​ ​ ​ ​ ​ 593,926 ​ ​ ​ ​ ​ 1,139,411 ​ ​ ​ ​ ​ 140,918 ​ ​
​
Addition (Subtraction):
Year-over-year change in
fair value of awards
granted in any prior fiscal
year that are outstanding
and unvested at year end
​ ​ ​ ​ (1,105,089) ​ ​ ​ ​ ​ (349,437) ​ ​ ​ ​ ​ 691,876 ​ ​ ​ ​ ​ 2,465,749 ​ ​ ​ ​ ​ 165,429 ​ ​ ​ ​ ​ (2,228,575) ​ ​ ​ ​ ​ (257,006) ​ ​
​
Addition (Subtraction):
Change as of the vesting
date (from the end of the
prior fiscal year) in fair
value of awards granted
in any prior fiscal year
for which vesting
conditions were satisfied
during such year
​ ​ ​ ​ (32,042) ​ ​ ​ ​ ​ (43,906) ​ ​ ​ ​ ​ 145,561 ​ ​ ​ ​ ​ 315,845 ​ ​ ​ ​ ​ 47,983 ​ ​ ​ ​ ​ (79,430) ​ ​ ​ ​ ​ (88,923) ​ ​
​
(Subtraction): Fair value
at end of prior year of
awards granted in any
prior fiscal year that fail
to meet the applicable
vesting conditions during
such year
​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ (26,967) ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ (287,560) ​ ​
​
Addition: Dividends on
vesting of restricted stock
grants
​ ​ ​ ​ 4,602 ​ ​ ​ ​ ​ 2,112 ​ ​ ​ ​ ​ 4,061 ​ ​ ​ ​ ​ 19,139 ​ ​ ​ ​ ​ 1,189 ​ ​ ​ ​ ​ 16,461 ​ ​ ​ ​ ​ 1,556 ​ ​
​
Compensation Actually Paid (as calculated)
​ ​ ​ ​ 2,122,227 ​ ​ ​ ​ ​ 698,603 ​ ​ ​ ​ ​ 4,921,346 ​ ​ ​ ​ ​ 4,658,162 ​ ​ ​ ​ ​ 1,482,689 ​ ​ ​ ​ ​ 405,184 ​ ​ ​ ​ ​ 202,581 ​ ​
Summary Compensation Table amounts reflect the grant date fair values of equity awards. For CAP calculation purposes, adjustments have been made to reflect fair values as of each measurement date. For stock options, this includes updated assumptions for term, stock price volatility, dividend yield, and risk-free rates. For performance-based restricted stock units, this includes actual and forecasted funding results where appropriate.
(3)
Company and peer group TSR for each year reflects what the cumulative value of $100 would be, including reinvestment of dividends, if such amount were invested on December 31, 2019. For purposes of the table, the Company’s peer group is the S&P 500 Industrials (Sector) (TR), as reflected in our stock performance graph in our Annual Report on Form 10-K.
​
(4)
Our company-selected measure, which is the measure we believe represents the most important financial performance not otherwise presented in the table above that we use to link compensation actually paid to our NEOs for fiscal 2022 to our performance, is adjusted earnings before interest, tax, depreciation and amortization in dollars (“Adjusted EBITDA $”), a non-GAAP measure, which is defined above under “Compensation Discussion and Analysis — Key Compensation Decisions for 2022 — 2022 Incentive Plan Structure.”
   
Company Selected Measure Name Adjusted EBITDA    
Named Executive Officers, Footnote [Text Block]
(1)
For 2022, the CEO was Mr. Huml (Current CEO) and the Other NEOs were Fay West, Richard H. Zay, Carol E. McKnight, and Kristin A. Erickson.
​
For 2021, the CEO was H. Chris Killingstad (Prior CEO) until February 28, 2021, and then David W. Huml became CEO March 1, 2021, and the Other NEOs were Fay West, Richard H. Zay, Carol E. McKnight, Daniel E. Glusick, Thomas Paulson, and Andrew Cebulla.
For 2020, the CEO was H. Chris Killingstad and the Other NEOs were David W. Huml, Richard H. Zay, Carol E. McKnight, Andrew Cebulla, Keith A. Woodward, and Mary E. Talbott.
   
Peer Group Issuers, Footnote [Text Block]
(3)
Company and peer group TSR for each year reflects what the cumulative value of $100 would be, including reinvestment of dividends, if such amount were invested on December 31, 2019. For purposes of the table, the Company’s peer group is the S&P 500 Industrials (Sector) (TR), as reflected in our stock performance graph in our Annual Report on Form 10-K.
   
Adjustment To PEO Compensation, Footnote [Text Block]
(2)
Compensation actually paid was determined by making the following adjustments for equity awards:
​
​ ​ ​ ​
2022
​ ​
2021
​ ​
2020
​
​ ​ ​ ​
Current
CEO
($)
​ ​
Average
of Other
NEOs
($)
​ ​
Current
CEO
($)
​ ​
Prior
CEO
($)
​ ​
Average
of Other
NEOs
($)
​ ​
CEO
($)
​ ​
Average
of Other
NEOs
($)
​
​ Total Compensation from
SCT 		​ ​ ​ ​ 4,104,579 ​ ​ ​ ​ ​ 1,294,266 ​ ​ ​ ​ ​ 4,303,328 ​ ​ ​ ​ ​ 2,709,314 ​ ​ ​ ​ ​ 1,375,494 ​ ​ ​ ​ ​ 4,245,227 ​ ​ ​ ​ ​ 1,199,543 ​ ​
​ Subtraction: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​
SCT Amounts
​ ​ ​ ​ 2,650,500 ​ ​ ​ ​ ​ 637,600 ​ ​ ​ ​ ​ 2,597,509 ​ ​ ​ ​ ​ 1,732,302 ​ ​ ​ ​ ​ 674,364 ​ ​ ​ ​ ​ 2,687,909 ​ ​ ​ ​ ​ 505,947 ​ ​
​ Adjustments: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​
Addition: Fair value at year-end of awards granted during the covered fiscal year that are outstanding and unvested at year-end
​ ​ ​ ​ 1,800,678 ​ ​ ​ ​ ​ 433,167 ​ ​ ​ ​ ​ 2,374,029 ​ ​ ​ ​ ​ 880,417 ​ ​ ​ ​ ​ 593,926 ​ ​ ​ ​ ​ 1,139,411 ​ ​ ​ ​ ​ 140,918 ​ ​
​
Addition (Subtraction):
Year-over-year change in
fair value of awards
granted in any prior fiscal
year that are outstanding
and unvested at year end
​ ​ ​ ​ (1,105,089) ​ ​ ​ ​ ​ (349,437) ​ ​ ​ ​ ​ 691,876 ​ ​ ​ ​ ​ 2,465,749 ​ ​ ​ ​ ​ 165,429 ​ ​ ​ ​ ​ (2,228,575) ​ ​ ​ ​ ​ (257,006) ​ ​
​
Addition (Subtraction):
Change as of the vesting
date (from the end of the
prior fiscal year) in fair
value of awards granted
in any prior fiscal year
for which vesting
conditions were satisfied
during such year
​ ​ ​ ​ (32,042) ​ ​ ​ ​ ​ (43,906) ​ ​ ​ ​ ​ 145,561 ​ ​ ​ ​ ​ 315,845 ​ ​ ​ ​ ​ 47,983 ​ ​ ​ ​ ​ (79,430) ​ ​ ​ ​ ​ (88,923) ​ ​
​
(Subtraction): Fair value
at end of prior year of
awards granted in any
prior fiscal year that fail
to meet the applicable
vesting conditions during
such year
​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ (26,967) ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ (287,560) ​ ​
​
Addition: Dividends on
vesting of restricted stock
grants
​ ​ ​ ​ 4,602 ​ ​ ​ ​ ​ 2,112 ​ ​ ​ ​ ​ 4,061 ​ ​ ​ ​ ​ 19,139 ​ ​ ​ ​ ​ 1,189 ​ ​ ​ ​ ​ 16,461 ​ ​ ​ ​ ​ 1,556 ​ ​
​
Compensation Actually Paid (as calculated)
​ ​ ​ ​ 2,122,227 ​ ​ ​ ​ ​ 698,603 ​ ​ ​ ​ ​ 4,921,346 ​ ​ ​ ​ ​ 4,658,162 ​ ​ ​ ​ ​ 1,482,689 ​ ​ ​ ​ ​ 405,184 ​ ​ ​ ​ ​ 202,581 ​ ​
Summary Compensation Table amounts reflect the grant date fair values of equity awards. For CAP calculation purposes, adjustments have been made to reflect fair values as of each measurement date. For stock options, this includes updated assumptions for term, stock price volatility, dividend yield, and risk-free rates. For performance-based restricted stock units, this includes actual and forecasted funding results where appropriate.
   
Non-PEO NEO Average Total Compensation Amount $ 1,294,266 $ 1,375,494 $ 1,199,543
Non-PEO NEO Average Compensation Actually Paid Amount $ 698,603 1,482,689 202,581
Adjustment to Non-PEO NEO Compensation Footnote [Text Block]
(2)
Compensation actually paid was determined by making the following adjustments for equity awards:
​
​ ​ ​ ​
2022
​ ​
2021
​ ​
2020
​
​ ​ ​ ​
Current
CEO
($)
​ ​
Average
of Other
NEOs
($)
​ ​
Current
CEO
($)
​ ​
Prior
CEO
($)
​ ​
Average
of Other
NEOs
($)
​ ​
CEO
($)
​ ​
Average
of Other
NEOs
($)
​
​ Total Compensation from
SCT 		​ ​ ​ ​ 4,104,579 ​ ​ ​ ​ ​ 1,294,266 ​ ​ ​ ​ ​ 4,303,328 ​ ​ ​ ​ ​ 2,709,314 ​ ​ ​ ​ ​ 1,375,494 ​ ​ ​ ​ ​ 4,245,227 ​ ​ ​ ​ ​ 1,199,543 ​ ​
​ Subtraction: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​
SCT Amounts
​ ​ ​ ​ 2,650,500 ​ ​ ​ ​ ​ 637,600 ​ ​ ​ ​ ​ 2,597,509 ​ ​ ​ ​ ​ 1,732,302 ​ ​ ​ ​ ​ 674,364 ​ ​ ​ ​ ​ 2,687,909 ​ ​ ​ ​ ​ 505,947 ​ ​
​ Adjustments: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​
Addition: Fair value at year-end of awards granted during the covered fiscal year that are outstanding and unvested at year-end
​ ​ ​ ​ 1,800,678 ​ ​ ​ ​ ​ 433,167 ​ ​ ​ ​ ​ 2,374,029 ​ ​ ​ ​ ​ 880,417 ​ ​ ​ ​ ​ 593,926 ​ ​ ​ ​ ​ 1,139,411 ​ ​ ​ ​ ​ 140,918 ​ ​
​
Addition (Subtraction):
Year-over-year change in
fair value of awards
granted in any prior fiscal
year that are outstanding
and unvested at year end
​ ​ ​ ​ (1,105,089) ​ ​ ​ ​ ​ (349,437) ​ ​ ​ ​ ​ 691,876 ​ ​ ​ ​ ​ 2,465,749 ​ ​ ​ ​ ​ 165,429 ​ ​ ​ ​ ​ (2,228,575) ​ ​ ​ ​ ​ (257,006) ​ ​
​
Addition (Subtraction):
Change as of the vesting
date (from the end of the
prior fiscal year) in fair
value of awards granted
in any prior fiscal year
for which vesting
conditions were satisfied
during such year
​ ​ ​ ​ (32,042) ​ ​ ​ ​ ​ (43,906) ​ ​ ​ ​ ​ 145,561 ​ ​ ​ ​ ​ 315,845 ​ ​ ​ ​ ​ 47,983 ​ ​ ​ ​ ​ (79,430) ​ ​ ​ ​ ​ (88,923) ​ ​
​
(Subtraction): Fair value
at end of prior year of
awards granted in any
prior fiscal year that fail
to meet the applicable
vesting conditions during
such year
​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ (26,967) ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ (287,560) ​ ​
​
Addition: Dividends on
vesting of restricted stock
grants
​ ​ ​ ​ 4,602 ​ ​ ​ ​ ​ 2,112 ​ ​ ​ ​ ​ 4,061 ​ ​ ​ ​ ​ 19,139 ​ ​ ​ ​ ​ 1,189 ​ ​ ​ ​ ​ 16,461 ​ ​ ​ ​ ​ 1,556 ​ ​
​
Compensation Actually Paid (as calculated)
​ ​ ​ ​ 2,122,227 ​ ​ ​ ​ ​ 698,603 ​ ​ ​ ​ ​ 4,921,346 ​ ​ ​ ​ ​ 4,658,162 ​ ​ ​ ​ ​ 1,482,689 ​ ​ ​ ​ ​ 405,184 ​ ​ ​ ​ ​ 202,581 ​ ​
Summary Compensation Table amounts reflect the grant date fair values of equity awards. For CAP calculation purposes, adjustments have been made to reflect fair values as of each measurement date. For stock options, this includes updated assumptions for term, stock price volatility, dividend yield, and risk-free rates. For performance-based restricted stock units, this includes actual and forecasted funding results where appropriate.
   
Compensation Actually Paid vs. Total Shareholder Return [Text Block]
[MISSING IMAGE: lc_captsr-4c.jpg]
   
Compensation Actually Paid vs. Net Income [Text Block]
[MISSING IMAGE: lc_capnetincome-4c.jpg]
   
Compensation Actually Paid vs. Company Selected Measure [Text Block]
[MISSING IMAGE: lc_adjebitds-4c.jpg]
   
Tabular List [Table Text Block]
Most Important Performance Measures for 2022
​ ​
Adjusted EBITDA $1
​ ​
​ ​
Adjusted EBITDA %1
​ ​
​ ​
Total Revenue
​ ​
​ ​
3-Year Average Incentive ROIC1
​ ​
​ ​
3-Year Average Incentive Cumulative Earnings Per Share1
​ ​
   
Total Shareholder Return Amount $ 82.27 106.64 91.24
Peer Group Total Shareholder Return Amount 127.15 134.52 111.06
Net Income (Loss) $ 66,300,000 $ 64,900,000 $ 33,700,000
Company Selected Measure Amount 133.7 140.2 119.4
PEO Name Mr. Huml    
Measure [Axis]: 1      
Pay vs Performance Disclosure [Table]      
Measure Name Adjusted EBITDA $1    
Non-GAAP Measure Description [Text Block]
(4)
Our company-selected measure, which is the measure we believe represents the most important financial performance not otherwise presented in the table above that we use to link compensation actually paid to our NEOs for fiscal 2022 to our performance, is adjusted earnings before interest, tax, depreciation and amortization in dollars (“Adjusted EBITDA $”), a non-GAAP measure, which is defined above under “Compensation Discussion and Analysis — Key Compensation Decisions for 2022 — 2022 Incentive Plan Structure.”
   
Measure [Axis]: 2      
Pay vs Performance Disclosure [Table]      
Measure Name Adjusted EBITDA %1    
Measure [Axis]: 3      
Pay vs Performance Disclosure [Table]      
Measure Name Total Revenue    
Measure [Axis]: 4      
Pay vs Performance Disclosure [Table]      
Measure Name 3-Year Average Incentive ROIC    
Measure [Axis]: 5      
Pay vs Performance Disclosure [Table]      
Measure Name 3-Year Average Incentive Cumulative Earnings Per Share    
David W. Huml [Member]      
Pay vs Performance Disclosure [Table]      
PEO Total Compensation Amount $ 4,104,579 $ 4,303,328  
PEO Actually Paid Compensation Amount 2,122,227 4,921,346  
David W. Huml [Member] | SCT Amounts [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (2,650,500) (2,597,509)  
David W. Huml [Member] | Fair value at year-end of awards granted during the covered fiscal year that are outstanding and unvested at year-end [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 1,800,678 2,374,029  
David W. Huml [Member] | Year-over-year change in fair value of awards granted in any prior fiscal year that are outstanding and unvested at year end [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (1,105,089) 691,876  
David W. Huml [Member] | Change as of the vesting date (from the end of the prior fiscal year) in fair value of awards granted in any prior fiscal year for which vesting conditions were satisfied during such year [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (32,042) 145,561  
David W. Huml [Member] | Dividends on vesting of restricted stock grants [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 4,602 4,061  
H. Chris Killingstad [Member]      
Pay vs Performance Disclosure [Table]      
PEO Total Compensation Amount   2,709,314 $ 4,245,227
PEO Actually Paid Compensation Amount   4,658,162 405,184
H. Chris Killingstad [Member] | SCT Amounts [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount   (1,732,302) (2,687,909)
H. Chris Killingstad [Member] | Fair value at year-end of awards granted during the covered fiscal year that are outstanding and unvested at year-end [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount   880,417 1,139,411
H. Chris Killingstad [Member] | Year-over-year change in fair value of awards granted in any prior fiscal year that are outstanding and unvested at year end [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount   2,465,749 (2,228,575)
H. Chris Killingstad [Member] | Change as of the vesting date (from the end of the prior fiscal year) in fair value of awards granted in any prior fiscal year for which vesting conditions were satisfied during such year [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount   315,845 (79,430)
H. Chris Killingstad [Member] | Dividends on vesting of restricted stock grants [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount   19,139 16,461
Non-PEO NEO [Member] | SCT Amounts [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (637,600) (674,364) (505,947)
Non-PEO NEO [Member] | Fair value at year-end of awards granted during the covered fiscal year that are outstanding and unvested at year-end [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount 433,167 593,926 140,918
Non-PEO NEO [Member] | Year-over-year change in fair value of awards granted in any prior fiscal year that are outstanding and unvested at year end [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (349,437) 165,429 (257,006)
Non-PEO NEO [Member] | Change as of the vesting date (from the end of the prior fiscal year) in fair value of awards granted in any prior fiscal year for which vesting conditions were satisfied during such year [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount (43,906) 47,983 (88,923)
Non-PEO NEO [Member] | Fair value at end of prior year of awards granted in any prior fiscal year that fail to meet the applicable vesting conditions during such year [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount   26,967 287,560
Non-PEO NEO [Member] | Dividends on vesting of restricted stock grants [Member]      
Pay vs Performance Disclosure [Table]      
Adjustment to Compensation Amount $ 2,112 $ 1,189 $ 1,556