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Revenue Recognition (Tables) | 12 Months Ended
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Dec. 31, 2020
Revenue Recognition |
Revenue by customer and timing recognition | ​
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Year Ended December 31, 2020 | Work Truck Attachments | Work Truck Solutions | Total Revenue
Independent dealer | $ 252,838 | $ 114,192 | $ 367,030
Government | - | 62,762 | 62,762
Fleet | - | 42,590 | 42,590
Other | - | 7,772 | 7,772
Total revenue | $ 252,838 | $ 227,316 | $ 480,154
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Year Ended December 31, 2019 | Work Truck Attachments | Work Truck Solutions | Total Revenue
Independent dealer | $ 293,630 | $ 127,484 | $ 421,114
Government | - | 72,810 | 72,810
Fleet | - | 66,306 | 66,306
Other | - | 11,480 | 11,480
Total revenue | $ 293,630 | $ 278,080 | $ 571,710
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Year Ended December 31, 2018 | Work Truck Attachments | Work Truck Solutions | Total Revenue
Independent dealer | $ 275,244 | $ 134,140 | $ 409,384
Government | - | 52,582 | 52,582
Fleet | - | 58,500 | 58,500
Other | - | 3,601 | 3,601
Total revenue | $ 275,244 | $ 248,823 | $ 524,067
​ Revenue by timing of revenue recognition was as follows:
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Year Ended December 31, 2020 | Work Truck Attachments | Work Truck Solutions | Total Revenue
Point in time | $ 252,838 | $ 149,675 | $ 402,513
Over time | - | 77,641 | 77,641
Total revenue | $ 252,838 | $ 227,316 | $ 480,154
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Year Ended December 31, 2019 | Work Truck Attachments | Work Truck Solutions | Total Revenue
Point in time | $ 293,630 | $ 172,269 | $ 465,899
Over time | - | 105,811 | 105,811
Total revenue | $ 293,630 | $ 278,080 | $ 571,710
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Year Ended December 31, 2018 | Work Truck Attachments | Work Truck Solutions | Total Revenue
Point in time | $ 275,244 | $ 153,873 | $ 429,117
Over time | - | 94,950 | 94,950
Total revenue | $ 275,244 | $ 248,823 | $ 524,067
Contract Balances | ​
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Year Ended December 31, 2020 | ​ | Balance at Beginning of Period | ​ | Additions | ​ | Deductions | ​ | Balance at End of Period
Contract liabilities | $ | 2,187 | $ | 14,931 | $ | (14,372) | $ | 2,746
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Year Ended December 31, 2019 | ​ | Balance at Beginning of Period | ​ | Additions | ​ | Deductions | ​ | Balance at End of Period
Contract liabilities | $ | 2,006 | $ | 16,082 | $ | (15,901) | $ | 2,187
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