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Accounting Standards and Significant Accounting Policies - Adoption of New Accounting Standard (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Statement of Income |  |  |  |  |
Total revenues | $ 236,060 | $ 208,763 | $ 457,234 | $ 408,492 |
Selling, general and administrative expenses | 52,262 | 43,000 | 99,866 | 85,780 |
Amortization of customer and trade name intangibles | 4,041 | 3,331 | 7,356 | 6,656 |
Operating income | 37,142 | 37,298 | 75,980 | 74,129 |
Income tax (benefit) provision | (1,461) | 5,427 | 151 | 9,299 |
Net income | $ 39,161 | $ 31,770 | $ 76,986 | $ 64,539 |
Earnings per common share: |  |  |  |  |
Basic (USD per share) | $ 1.02 | $ 0.86 | $ 2.00 | $ 1.74 |
Diluted (USD per share) | $ 0.97 | $ 0.81 | $ 1.91 | $ 1.65 |
Balance Sheet |  |  |  |  |
Accounts receivable | $ 299,253 |  | $ 299,253 |  | $ 246,188
Prepaid expenses | 34,985 |  | 34,985 |  | 32,206
Accounts receivable, long-term | 12,387 |  | 12,387 |  | 12,107
Other intangibles, net | 293,194 |  | 293,194 |  | 229,617
Total assets | 1,759,759 |  | 1,759,759 |  | 1,611,351
Deferred revenue | 316,084 |  | 316,084 |  | 298,613
Deferred income taxes | 44,803 |  | 44,803 |  | 46,879
Retained earnings | 701,449 |  | 701,449 |  | 624,463
Total liabilities and shareholders' equity | 1,759,759 |  | 1,759,759 |  | 1,611,351
As Reported |  |  |  |  |
Statement of Income |  |  |  |  |
Total revenues |  | $ 209,123 |  | $ 408,665 |
Selling, general and administrative expenses |  | 43,451 |  | 86,593 |
Amortization of customer and trade name intangibles |  | 3,463 |  | 6,921 |
Operating income |  | 37,075 |  | 73,224 |
Income tax (benefit) provision |  | 5,396 |  | 9,049 |
Net income |  | $ 31,578 |  | $ 63,884 |
Earnings per common share: |  |  |  |  |
Basic (USD per share) |  | $ 0.85 |  | $ 1.72 |
Diluted (USD per share) |  | $ 0.81 |  | $ 1.63 |
Balance Sheet |  |  |  |  |
Accounts receivable |  |  |  |  | 227,127
Prepaid expenses |  |  |  |  | 27,252
Accounts receivable, long-term |  |  |  |  | 7,536
Other intangibles, net |  |  |  |  | 236,444
Total assets |  |  |  |  | 1,589,592
Deferred revenue |  |  |  |  | 309,461
Deferred income taxes |  |  |  |  | 38,914
Retained earnings |  |  |  |  | 599,821
Total liabilities and shareholders' equity |  |  |  |  | 1,589,592
Accounting Standards Update 2014-09 | Adjustments |  |  |  |  |
Statement of Income |  |  |  |  |
Total revenues |  | $ (360) |  | $ (173) |
Selling, general and administrative expenses |  | (451) |  | (813) |
Amortization of customer and trade name intangibles |  | (132) |  | (265) |
Operating income |  | 223 |  | 905 |
Income tax (benefit) provision |  | 31 |  | 250 |
Net income |  | 192 |  | 655 |
Balance Sheet |  |  |  |  |
Accounts receivable |  |  |  |  | 19,061
Prepaid expenses |  |  |  |  | 4,954
Accounts receivable, long-term |  |  |  |  | 4,571
Other intangibles, net |  |  |  |  | (6,827)
Total assets |  |  |  |  | 21,759
Deferred revenue |  |  |  |  | (10,848)
Deferred income taxes |  |  |  |  | 7,965
Retained earnings |  |  |  |  | 24,642
Total liabilities and shareholders' equity |  |  |  |  | $ 21,759
Software licenses and royalties |  |  |  |  |
Statement of Income |  |  |  |  |
Total revenues | 22,400 | 19,306 | 45,176 | 41,064 |
Software licenses and royalties | As Reported |  |  |  |  |
Statement of Income |  |  |  |  |
Total revenues |  | 17,107 |  | 35,330 |
Software licenses and royalties | Accounting Standards Update 2014-09 | Adjustments |  |  |  |  |
Statement of Income |  |  |  |  |
Total revenues |  | 2,199 |  | 5,734 |
Subscriptions |  |  |  |  |
Statement of Income |  |  |  |  |
Total revenues | 53,009 | 40,517 | 102,037 | 80,379 |
Subscriptions | As Reported |  |  |  |  |
Statement of Income |  |  |  |  |
Total revenues |  | 40,947 |  | 81,049 |
Subscriptions | Accounting Standards Update 2014-09 | Adjustments |  |  |  |  |
Statement of Income |  |  |  |  |
Total revenues |  | (430) |  | (670) |
Software services |  |  |  |  |
Statement of Income |  |  |  |  |
Total revenues | 50,674 | 45,860 | 96,613 | 88,356 |
Software services | As Reported |  |  |  |  |
Statement of Income |  |  |  |  |
Total revenues |  | 47,372 |  | 92,390 |
Software services | Accounting Standards Update 2014-09 | Adjustments |  |  |  |  |
Statement of Income |  |  |  |  |
Total revenues |  | (1,512) |  | (4,034) |
Maintenance |  |  |  |  |
Statement of Income |  |  |  |  |
Total revenues | 96,076 | 88,811 | 189,973 | 175,118 |
Maintenance | As Reported |  |  |  |  |
Statement of Income |  |  |  |  |
Total revenues |  | 89,412 |  | 176,271 |
Maintenance | Accounting Standards Update 2014-09 | Adjustments |  |  |  |  |
Statement of Income |  |  |  |  |
Total revenues |  | (601) |  | (1,153) |
Appraisal services |  |  |  |  |
Statement of Income |  |  |  |  |
Total revenues | 5,532 | 6,366 | 10,926 | 12,978 |
Appraisal services | As Reported |  |  |  |  |
Statement of Income |  |  |  |  |
Total revenues |  | 6,366 |  | 12,978 |
Appraisal services | Accounting Standards Update 2014-09 | Adjustments |  |  |  |  |
Statement of Income |  |  |  |  |
Total revenues |  | 0 |  | 0 |
Hardware and other |  |  |  |  |
Statement of Income |  |  |  |  |
Total revenues | $ 8,369 | 7,903 | $ 12,509 | 10,597 |
Hardware and other | As Reported |  |  |  |  |
Statement of Income |  |  |  |  |
Total revenues |  | 7,919 |  | 10,647 |
Hardware and other | Accounting Standards Update 2014-09 | Adjustments |  |  |  |  |
Statement of Income |  |  |  |  |
Total revenues |  | $ (16) |  | $ (50) |

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