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Revenue from Contracts with Customers (Details 4) - USD ($) $ in Thousands | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
ASSETS |  |  |
Accounts receivable, net | $ 54,240 | $ 77,087 | $ 81,397
Contract assets | 2,362 | 4,720 | 0
Other current assets | 2,536 | 4,273 | 3,900
Other assets | 6,591 | 4,248 | 3,230
LIABILITIES |  |  |
Deferred revenue and related expenses | 6,034 | 5,906 | 5,342
Deferred income taxes | 0 | 892 | 773
Other current liabilities | 3,564 | 3,977 | 3,732
Other long-term liabilities | 4,060 | 4,503 | 4,201
STOCKHOLDERS’ EQUITY |  |  |
Retained earnings | 812,704 | 795,154 | 794,583
Total assets | 125,175 |  | 130,812
Liabilities | 134,636 |  | 165,447
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |
ASSETS |  |  |
Accounts receivable, net |  |  | 81,397
Contract assets |  |  | 0
Other current assets |  |  | 3,900
Other assets |  |  | 3,230
LIABILITIES |  |  |
Deferred revenue and related expenses |  |  | 5,342
Deferred income taxes |  |  | 773
Other current liabilities |  |  | 3,732
Other long-term liabilities |  |  | 4,201
STOCKHOLDERS’ EQUITY |  |  |
Retained earnings |  |  | $ 794,583
Cumulative Adjustments | Accounting Standards Update 2014-09 |  |  |
ASSETS |  |  |
Accounts receivable, net |  | (4,310) |
Contract assets |  | 4,720 |
Other current assets |  | 373 |
Other assets |  | 1,018 |
LIABILITIES |  |  |
Deferred revenue and related expenses |  | 564 |
Deferred income taxes |  | 119 |
Other current liabilities |  | 245 |
Other long-term liabilities |  | 302 |
STOCKHOLDERS’ EQUITY |  |  |
Retained earnings | 1,300 | $ 571 |
Total assets | 1,800 |  |
Liabilities | $ 500 |  |

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