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Condensed Consolidated Statements of Changes in Redeemable Non-Controlling Interests and Stockholders' Equity - USD ($) $ in Thousands | Total | Class A Common Stock | Class B Common Stock | Common Stock Class A Common Stock | Common Stock Class B Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Loss | Treasury Stock
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Redeemable non-controlling interests, beginning balance at Dec. 31, 2019 | $ 31,616 |  |  |  |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Contributions from redeemable non-controlling interests, net of tax equity financing fees | 488 |  |  |  |  |  |  |  |
Distributions to redeemable non-controlling interests | (707) |  |  |  |  |  |  |  |
Net income | 4,906 |  |  |  |  |  |  |  |
Redeemable non-controlling interests, ending balance at Jun. 30, 2020 | 36,303 |  |  |  |  |  |  |  |
Beginning balance (in shares) at Dec. 31, 2019 |  |  |  | 29,230,005 | 18,000,000 |  |  |  | (2,101,340)
Beginning balance at Dec. 31, 2019 | 428,856 |  |  | $ 3 | $ 2 | $ 133,688 | $ 314,459 | $ (7,514) | $ (11,782)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Exercise of stock options (in shares) |  |  |  | 460,250 |  |  |  |  |
Exercise of stock options | 4,638 |  |  |  |  | 4,638 |  |  |
Stock-based compensation expense | 859 |  |  |  |  | 859 |  |  |
Employee stock purchase plan (in shares) |  |  |  | 28,302 |  |  |  |  |
Employee stock purchase plan | 440 |  |  |  |  | 440 |  |  |
Open market purchase of common shares (in shares) |  |  |  | (455) |  |  |  |  | 455
Open market purchase of common shares | (6) |  |  |  |  |  |  |  | $ (6)
Unrealized gain (loss) from interest rate hedges, net | (4,050) |  |  |  |  |  |  | (4,050) |
Foreign currency translation adjustment | (1,630) |  |  |  |  |  |  | (1,630) |
Net income | 10,566 |  |  |  |  |  | 10,566 |  |
Ending balance (in shares) at Jun. 30, 2020 |  |  |  | 29,718,102 | 18,000,000 |  |  |  | (2,101,795)
Ending balance at Jun. 30, 2020 | 439,673 |  |  | $ 3 | $ 2 | 139,625 | 325,025 | (13,194) | $ (11,788)
Redeemable non-controlling interests, beginning balance at Mar. 31, 2020 | 31,939 |  |  |  |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Contributions from redeemable non-controlling interests, net of tax equity financing fees | 488 |  |  |  |  |  |  |  |
Distributions to redeemable non-controlling interests | (595) |  |  |  |  |  |  |  |
Net income | 4,471 |  |  |  |  |  |  |  |
Redeemable non-controlling interests, ending balance at Jun. 30, 2020 | 36,303 |  |  |  |  |  |  |  |
Beginning balance (in shares) at Mar. 31, 2020 |  |  |  | 29,510,161 | 18,000,000 |  |  |  | (2,101,795)
Beginning balance at Mar. 31, 2020 | 432,177 |  |  | $ 3 | $ 2 | 136,591 | 320,660 | (13,291) | $ (11,788)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Exercise of stock options (in shares) |  |  |  | 179,639 |  |  |  |  |
Exercise of stock options | 2,164 |  |  |  |  | 2,164 |  |  |
Stock-based compensation expense | 430 |  |  |  |  | 430 |  |  |
Employee stock purchase plan (in shares) |  |  |  | 28,302 |  |  |  |  |
Employee stock purchase plan | 440 |  |  |  |  | 440 |  |  |
Unrealized gain (loss) from interest rate hedges, net | (585) |  |  |  |  |  |  | (585) |
Foreign currency translation adjustment | 682 |  |  |  |  |  |  | 682 |
Net income | 4,365 |  |  |  |  |  | 4,365 |  |
Ending balance (in shares) at Jun. 30, 2020 |  |  |  | 29,718,102 | 18,000,000 |  |  |  | (2,101,795)
Ending balance at Jun. 30, 2020 | 439,673 |  |  | $ 3 | $ 2 | 139,625 | 325,025 | (13,194) | $ (11,788)
Redeemable non-controlling interests, beginning balance at Dec. 31, 2020 | 38,850 |  |  |  |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Contributions from redeemable non-controlling interests, net of tax equity financing fees | 2,252 |  |  |  |  |  |  |  |
Distributions to redeemable non-controlling interests | (648) |  |  |  |  |  |  |  |
Accretion of tax equity financing fees | 61 |  |  |  |  |  |  |  |
Net income | 5,488 |  |  |  |  |  |  |  |
Redeemable non-controlling interests, ending balance at Jun. 30, 2021 | 46,003 |  |  |  |  |  |  |  |
Beginning balance (in shares) at Dec. 31, 2020 |  | 30,224,654 | 18,000,000 | 30,224,654 | 18,000,000 |  |  |  | (2,101,795)
Beginning balance at Dec. 31, 2020 | 492,813 |  |  | $ 3 | $ 2 | 145,496 | 368,390 | (9,290) | $ (11,788)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Equity offering costs (in shares) |  |  |  | 2,875,000 |  |  |  |  |
Equity offering costs | 120,081 |  |  |  |  | 120,081 |  |  |
Exercise of stock options (in shares) |  |  |  | 267,380 |  |  |  |  |
Exercise of stock options | 2,611 |  |  |  |  | 2,611 |  |  |
Stock-based compensation expense | 2,115 |  |  |  |  | 2,115 |  |  |
Employee stock purchase plan (in shares) |  |  |  | 15,297 |  |  |  |  |
Employee stock purchase plan | 652 |  |  |  |  | 652 |  |  |
Unrealized gain (loss) from interest rate hedges, net | 1,645 |  |  |  |  |  |  | 1,645 |
Foreign currency translation adjustment | 891 |  |  |  |  |  |  | 891 |
Accretion of tax equity financing fees | (61) |  |  |  |  |  | (61) |  |
Net income | 24,829 |  |  |  |  |  | 24,829 |  |
Ending balance (in shares) at Jun. 30, 2021 |  | 33,382,331 | 18,000,000 | 33,382,331 | 18,000,000 |  |  |  | (2,101,795)
Ending balance at Jun. 30, 2021 | 645,576 |  |  | $ 3 | $ 2 | 270,955 | 393,158 | (6,754) | $ (11,788)
Redeemable non-controlling interests, beginning balance at Mar. 31, 2021 | 39,668 |  |  |  |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Contributions from redeemable non-controlling interests, net of tax equity financing fees | 2,269 |  |  |  |  |  |  |  |
Distributions to redeemable non-controlling interests | (195) |  |  |  |  |  |  |  |
Accretion of tax equity financing fees | 30 |  |  |  |  |  |  |  |
Net income | 4,231 |  |  |  |  |  |  |  |
Redeemable non-controlling interests, ending balance at Jun. 30, 2021 | 46,003 |  |  |  |  |  |  |  |
Beginning balance (in shares) at Mar. 31, 2021 |  |  |  | 33,265,925 | 18,000,000 |  |  |  | (2,101,795)
Beginning balance at Mar. 31, 2021 | 628,855 |  |  | $ 3 | $ 2 | 267,864 | 379,533 | (6,759) | $ (11,788)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Equity offering costs (in shares) |  |  |  | 0 |  |  |  |  |
Equity offering costs | (135) |  |  |  |  | (135) |  |  |
Exercise of stock options (in shares) |  |  |  | 101,109 |  |  |  |  |
Exercise of stock options | 1,225 |  |  |  |  | 1,225 |  |  |
Stock-based compensation expense | 1,349 |  |  |  |  | 1,349 |  |  |
Employee stock purchase plan (in shares) |  |  |  | 15,297 |  |  |  |  |
Employee stock purchase plan | 652 |  |  |  |  | 652 |  |  |
Unrealized gain (loss) from interest rate hedges, net | (472) |  |  |  |  |  |  | (472) |
Foreign currency translation adjustment | 477 |  |  |  |  |  |  | 477 |
Accretion of tax equity financing fees | (30) |  |  |  |  |  | (30) |  |
Net income | 13,655 |  |  |  |  |  | 13,655 |  |
Ending balance (in shares) at Jun. 30, 2021 |  | 33,382,331 | 18,000,000 | 33,382,331 | 18,000,000 |  |  |  | (2,101,795)
Ending balance at Jun. 30, 2021 | $ 645,576 |  |  | $ 3 | $ 2 | $ 270,955 | $ 393,158 | $ (6,754) | $ (11,788)

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