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Accounting Changes and Error Corrections (Schedule of Error Corrections) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Error Corrections and Prior Period Adjustments Restatement [Line Items]                          
Prepaid Expense and Other Assets, Current $ 94,838 $ 91,600 $ 88,300 $ 87,700 $ 92,400 $ 94,700 $ 91,600 $ 92,400 $ 94,838 $ 87,700 $ 81,572 $ 99,400  
Assets, Current 638,835 1,155,100 627,600 655,800 1,079,300 577,200 1,155,100 1,079,300 638,835 655,800 976,593 929,900  
Assets 2,104,441 2,630,500 2,102,400 2,601,200 3,042,900 2,549,300 2,630,500 3,042,900 2,104,441 2,601,200 2,496,000 2,912,400  
Accrued Expenses And Other Current Liabilities, 53,050 42,100 46,100 49,600 52,500 76,100 42,100 52,500 53,050 49,600 76,484 64,900  
Contract with Customer, Liability, Current 383,138 398,800 325,600 410,400 425,800 359,200 398,800 425,800 383,138 410,400 358,546 390,900  
Liabilities, Current 929,382 1,380,900 864,300 962,000 1,348,500 862,200 1,380,900 1,348,500 929,382 962,000 1,252,055 1,196,100  
Liabilities 1,996,252 2,557,800 2,084,900 2,056,400 2,465,400 2,015,200 2,557,800 2,465,400 1,996,252 2,056,400 2,369,161 2,102,500  
Retained earnings (21,176) (68,700) (95,100) 246,900 228,600 207,400 (68,700) 228,600 (21,176) 246,900 (99,457) 200,100  
Stockholders' Equity Attributable to Parent 108,189 72,738 17,477 544,773 577,484 534,028 72,738 577,484 108,189 544,773 126,839 809,903 $ 744,000
Liabilities and Equity 2,104,441 2,630,500 2,102,400 2,601,200 3,042,900 2,549,300 2,630,500 3,042,900 2,104,441 2,601,200 2,496,000 2,912,400  
Deferred tax liability 9,246 25,300 25,100 68,200 75,800 83,000 25,300 75,800 9,246 68,200 24,999    
Liabilities, Noncurrent   1,176,900 1,220,600 1,094,400 1,116,900 1,153,000 1,176,900 1,116,900   1,094,400 1,117,100    
Additional paid-in capital 1,369,807     1,227,200 1,206,100 1,181,100   1,206,100 1,369,807 1,227,200 1,291,442    
Accounts Receivable, after Allowance for Credit Loss, Current 82,561 146,000 78,100       146,000   82,561   83,539    
Revenue 281,143 282,000 269,900 286,598 [1] 287,300 278,600 552,000 565,900 833,109 852,511 [2] 1,154,600 1,107,100  
Cost of revenue 113,653     129,290 126,400 127,900   254,300 342,101 383,615 523,200 508,000  
Gross Profit 167,490 168,400 155,100 157,308 160,900 150,700 323,500 311,600 491,008 468,896 631,400 599,100  
Research and development 37,198     37,916 37,400 40,700   78,100 104,352 116,045 153,700 147,500  
Operating Expenses 112,917     116,161 119,500 137,400   256,900 359,396 373,011 902,800 552,700  
Operating Income (Loss) 54,573 57,300 19,700 41,147 41,400 13,300 77,000 54,700 131,612 95,885 (271,400) 46,400  
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 41,044 40,000 4,900 30,004 29,000 6,400 44,900 35,400 85,950 65,408 (312,500) 19,300  
Income tax (benefit) provision (6,448) 13,600 500 11,714 7,800 (900) 14,100 6,900 7,669 18,568 (12,900) 16,300  
Net income $ 47,492 $ 26,466 $ 4,323 $ 18,290 $ 21,244 $ 7,306 $ 30,800 $ 28,600 $ 78,281 $ 46,840 $ (299,500) $ 3,000  
Basic earnings per share $ 1.00 $ 0.55 $ 0.09 $ 0.36 $ 0.42 $ 0.14 $ 0.64 $ 0.56 $ 1.63 $ 0.92 $ (5.92) $ 0.06  
Diluted earnings per share $ 0.98 $ 0.55 $ 0.09 $ 0.35 $ 0.41 $ 0.14 $ 0.63 $ 0.55 $ 1.61 $ 0.90 $ (5.92) $ 0.06  
Comprehensive Income (Loss), Net of Tax, Attributable to Parent $ 44,586 $ 28,500 $ 900 $ 11,228 $ 20,200 $ 10,200 $ 29,400 $ 30,400 $ 73,952 $ 41,641 $ (302,700) $ (7,600)  
Sales, marketing and customer success 44,105     49,808 47,200 50,400   97,600 132,795 147,400 197,500    
General and administrative 31,044     27,519 34,000 45,400   79,300 120,579 106,842 142,700    
Increase (Decrease) in Prepaid Expense and Other Assets     5,200     3,200 9,000 2,500 (9,707) (934) (3,200) 16,700  
Increase Decrease Accrued Expenses And Other Liabilities     (8,100)     8,100 (9,900) (13,400) 2,033 (16,089) (13,000) (29,700)  
Increase (Decrease) in Deferred Revenue     (29,400)     (25,400) 38,800 36,600 22,991 19,527 (1,900) 7,200  
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation     1,400     65,300 68,300 118,400 207,540 222,386 296,000 199,600  
Stock-based compensation expense           30,300   55,300 71,079 76,430 105,000    
Deferred taxes           (11,700)   (18,400) (16,682) (21,776) (69,500)    
Increase (Decrease) in Accounts Payable, Trade           23,800   19,100 (3,233) 18,322 28,300    
Payments to Acquire Property, Plant, and Equipment           (1,000)   (6,100) (4,805) (7,235) (7,400)    
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation           (15,200)   (40,700) (57,308) (56,325) (73,400)    
Provision for doubtful accounts and sales returns     800       3,000   3,788 1,721      
APIC, Share-based Payment Arrangement, Increase for Cost Recognition 22,573 27,672 28,120 21,125 25,019 30,286              
Retained earnings [Member]                          
Error Corrections and Prior Period Adjustments Restatement [Line Items]                          
Stockholders' Equity Attributable to Parent (21,176) (68,668) (95,134) 246,907 228,617 207,373 (68,668) 228,617 (21,176) 246,907 (99,457) 200,067 197,000
Net income 47,492 26,466 4,323 18,290 21,244 7,306         (299,500) 3,000  
APIC, Share-based Payment Arrangement, Increase for Cost Recognition 0 0 0 0 0 0              
Additional paid-in capital [Member]                          
Error Corrections and Prior Period Adjustments Restatement [Line Items]                          
Stockholders' Equity Attributable to Parent 1,369,807 1,347,234 1,319,562 1,227,198 1,206,073 1,181,054 1,347,234 1,206,073 $ 1,369,807 1,227,198 1,291,442 1,203,012  
APIC, Share-based Payment Arrangement, Increase for Cost Recognition $ 22,573 27,672 28,120 21,125 25,019 30,286              
Previously Reported                          
Error Corrections and Prior Period Adjustments Restatement [Line Items]                          
Prepaid Expense and Other Assets, Current   91,200 88,200 87,500 92,300 94,600 91,200 92,300   87,500 81,300 99,300  
Assets, Current   1,154,000 627,500 655,600 1,079,200 577,100 1,154,000 1,079,200   655,600 976,300 929,800  
Assets   2,629,400 2,102,200 2,601,000 3,042,700 2,549,100 2,629,400 3,042,700   2,601,000 2,495,700 2,912,300  
Accrued Expenses And Other Current Liabilities,   40,900 45,100 48,700 51,700 75,300 40,900 51,700   48,700 75,500 64,300  
Contract with Customer, Liability, Current   399,200 326,200 411,600 427,100 360,400 399,200 427,100   411,600 359,500 392,500  
Liabilities, Current   1,380,100 863,900 962,200 1,349,000 862,600 1,380,100 1,349,000   962,200 1,252,100 1,197,100  
Liabilities   2,541,400 2,069,000 2,056,600 2,465,400 2,015,100 2,541,400 2,465,400   2,056,600 2,353,700 2,103,600  
Retained earnings   (53,500) (79,400) 246,500 225,900 204,100 (53,500) 225,900   246,500 (84,300) 198,900  
Stockholders' Equity Attributable to Parent   88,000 33,200 544,300 577,300 534,100 88,000 577,300   544,300 142,000 808,700 744,000
Liabilities and Equity   2,629,400 2,102,200 2,601,000 3,042,700 2,549,100 2,629,400 3,042,700   2,601,000 2,495,700 2,912,300  
Deferred tax liability   9,800 9,600 68,200 75,400 82,400 9,800 75,400   68,200 9,500    
Liabilities, Noncurrent   1,161,400 1,205,100 1,094,400 1,116,400 1,152,500 1,161,400 1,116,400   1,094,400 1,101,600    
Additional paid-in capital       1,227,200 1,208,600 1,184,300   1,208,600   1,227,200 1,291,400    
Accounts Receivable, after Allowance for Credit Loss, Current   145,200 78,100       145,200            
Revenue   281,400 270,700 286,700 287,300 279,300 552,000 566,500   853,300 1,155,500 1,105,400  
Cost of revenue       127,500 124,700 126,200   250,900   378,400 516,300 502,200  
Gross Profit   167,700 155,800 159,200 162,600 153,000 323,600 315,600   474,800 639,200 603,200  
Research and development       39,400 39,100 42,800   81,900   121,200 160,600 153,300  
Operating Expenses       115,400 120,500 142,300   262,800   378,200 909,700 558,500  
Operating Income (Loss)   56,700 20,400 43,800 42,100 10,700 77,100 52,800   96,600 (270,500) 44,700  
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest   39,400 5,600 32,700 29,700 3,800 45,000 33,500   66,200 (311,600) 17,600  
Income tax (benefit) provision   13,400 700 12,100 7,900 (1,500) 14,100 6,400   18,600 (28,400) 15,800  
Net income   $ 26,000 $ 4,900 $ 20,500 $ 21,800 $ 5,200 $ 30,800 $ 27,100   $ 47,600 $ (283,200) $ 1,800  
Basic earnings per share   $ 0.54 $ 0.10 $ 0.41 $ 0.43 $ 0.10 $ 0.64 $ 0.53   $ 0.93 $ (5.60) $ 0.03  
Diluted earnings per share   $ 0.54 $ 0.10 $ 0.40 $ 0.42 $ 0.10 $ 0.63 $ 0.52   $ 0.91 $ (5.60) $ 0.03  
Comprehensive Income (Loss), Net of Tax, Attributable to Parent   $ 28,000 $ 1,400 $ 13,500 $ 20,800 $ 8,200 $ 29,400 $ 28,900   $ 42,400 $ (286,400) $ (8,800)  
Sales, marketing and customer success       49,500 47,100 50,900   97,900   147,400 197,500    
General and administrative       25,600 33,400 47,800   81,200   106,800 142,700    
Increase (Decrease) in Prepaid Expense and Other Assets     5,300     3,300 8,900 2,500   900 (3,300) 16,900  
Increase Decrease Accrued Expenses And Other Liabilities     (8,200)     7,900 (10,200) (13,600)   (16,400) (13,300) (30,300)  
Increase (Decrease) in Deferred Revenue     (29,800)     (25,800) 38,200 36,200   19,000 (2,500) 8,900  
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation     1,400     64,600 68,300 118,400   222,400 296,000 199,600  
Stock-based compensation expense           33,600   57,900   76,400 105,000    
Deferred taxes           (12,200)   (18,800)   (21,800) (85,000)    
Increase (Decrease) in Accounts Payable, Trade           23,100   19,100   18,300 28,300    
Payments to Acquire Property, Plant, and Equipment           (300)   (6,100)   (7,200) (7,400)    
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation           (14,500)   (40,700)   (56,300) (73,400)    
Provision for doubtful accounts and sales returns     800       3,800            
APIC, Share-based Payment Arrangement, Increase for Cost Recognition       18,600 24,300 33,600              
Previously Reported | Retained earnings [Member]                          
Error Corrections and Prior Period Adjustments Restatement [Line Items]                          
Stockholders' Equity Attributable to Parent   (53,500) (79,400) 246,500 225,900 204,100 (53,500) 225,900   246,500 (84,300) 198,900 197,000
Net income   26,000 4,900 20,500 21,800 5,200         (283,200) 1,800  
APIC, Share-based Payment Arrangement, Increase for Cost Recognition       0 0 0              
Previously Reported | Additional paid-in capital [Member]                          
Error Corrections and Prior Period Adjustments Restatement [Line Items]                          
Stockholders' Equity Attributable to Parent   1,347,200 1,319,600 1,227,200 1,208,600 1,184,300 1,347,200 1,208,600   1,227,200 1,291,400 1,203,000  
APIC, Share-based Payment Arrangement, Increase for Cost Recognition       18,600 24,300 33,600              
Revision of Prior Period, Error Correction, Adjustment                          
Error Corrections and Prior Period Adjustments Restatement [Line Items]                          
Prepaid Expense and Other Assets, Current   300 100 200 100 100 300 100   200 300 100  
Assets, Current   1,100 100 200 100 100 1,100 100   200 300 100  
Assets   1,100 100 200 100 100 1,100 100   200 300 100  
Accrued Expenses And Other Current Liabilities,   1,200 1,000 900 800 800 1,200 800   900 900 600  
Contract with Customer, Liability, Current   (400) (700) (1,100) (1,300) (1,200) (400) (1,300)   (1,100) (1,000) (1,700)  
Liabilities, Current   900 400 (200) (500) (400) 900 (500)   (200) 0 (1,100)  
Liabilities   16,300 15,800 (200) 0 100 16,300 0   (200) 15,400 (1,100)  
Retained earnings   (15,200) (15,700) 400 2,700 3,300 (15,200) 2,700   400 (15,200) 1,200  
Stockholders' Equity Attributable to Parent   (15,200) (15,700) 400 100 0 (15,200) 100   400 (15,200) 1,200 0
Liabilities and Equity   1,100 100 200 100 100 1,100 100   200 300 100  
Deferred tax liability   15,500 15,500 0 400 600 15,500 400   0 15,500    
Liabilities, Noncurrent   15,500 15,500 0 400 600 15,500 400   0 15,500    
Additional paid-in capital       0 (2,600) (3,300)   (2,600)   0 0    
Accounts Receivable, after Allowance for Credit Loss, Current   800 0       800            
Revenue   600 (700) (100) 100 (700) (100) (600)   (800) (900) 1,600  
Cost of revenue       1,800 1,700 1,700   3,400   5,200 6,900 5,800  
Gross Profit   600 (700) (1,900) (1,700) (2,300) (100) (4,000)   (5,900) (7,800) (4,200)  
Research and development       (1,500) (1,700) (2,100)   (3,700)   (5,200) (6,900) (5,800)  
Operating Expenses       800 (1,000) (5,000)   (6,000)   (5,200) (6,900) (5,800)  
Operating Income (Loss)   600 (700) (2,700) (700) 2,600 (100) 1,900   (800) (900) 1,600  
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest   600 (700) (2,700) (700) 2,600 (100) 1,900   (800) (900) 1,600  
Income tax (benefit) provision   200 (200) (400) (100) 600 0 400   0 15,500 500  
Net income   $ 500 $ (500) $ (2,300) $ (600) $ 2,100 $ (100) $ 1,500   $ (800) $ (16,400) $ 1,200  
Basic earnings per share   $ 0.01 $ (0.01) $ (0.05) $ (0.01) $ 0.04 $ 0 $ 0.03   $ (0.01) $ (0.32) $ 0.03  
Diluted earnings per share   $ 0.01 $ (0.01) $ (0.05) $ (0.01) $ 0.04 $ 0 $ 0.03   $ (0.01) $ (0.32) $ 0.03  
Comprehensive Income (Loss), Net of Tax, Attributable to Parent   $ 500 $ (500) $ (2,300) $ (600) $ 2,100 $ (100) $ 1,500   $ (800) $ (16,400) $ 1,200  
Sales, marketing and customer success       400 100 (500)   (400)   0 0    
General and administrative       1,900 500 (2,400)   (1,900)   0 0    
Increase (Decrease) in Prepaid Expense and Other Assets     (100)     0 0 0   100 100 (100)  
Increase Decrease Accrued Expenses And Other Liabilities     100     200 300 200   300 300 600  
Increase (Decrease) in Deferred Revenue     300     500 600 400   500 700 (1,700)  
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation     0     700 0 0   0 0 0  
Stock-based compensation expense           (3,300)   (2,600)   0 0    
Deferred taxes           600   400   0 15,500    
Increase (Decrease) in Accounts Payable, Trade           700   0   0 0    
Payments to Acquire Property, Plant, and Equipment           700   0   0 0    
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation           (700)   0   0 0    
Provision for doubtful accounts and sales returns     0       (800)            
APIC, Share-based Payment Arrangement, Increase for Cost Recognition       2,600 700 (3,300)              
Revision of Prior Period, Error Correction, Adjustment | Retained earnings [Member]                          
Error Corrections and Prior Period Adjustments Restatement [Line Items]                          
Stockholders' Equity Attributable to Parent   (15,200) (15,700) 400 2,700 3,300 (15,200) 2,700   400 (15,200) 1,200 $ 0
Net income   500 (500) (2,300) (600) 2,100         (16,400) 1,200  
APIC, Share-based Payment Arrangement, Increase for Cost Recognition       0 0 0              
Revision of Prior Period, Error Correction, Adjustment | Additional paid-in capital [Member]                          
Error Corrections and Prior Period Adjustments Restatement [Line Items]                          
Stockholders' Equity Attributable to Parent   $ 0 $ 0 0 (2,600) (3,300) $ 0 $ (2,600)   $ 0 $ 0 $ 0  
APIC, Share-based Payment Arrangement, Increase for Cost Recognition       $ 2,600 $ 700 $ (3,300)              
[1] We have revised certain amounts for the three and nine months ended September 30, 2024. See Note 2 and Note 13 for additional information.
[2] We have revised certain amounts for the three and nine months ended September 30, 2024. See Note 2 and Note 13 for additional information.