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Business Combinations (Summary of Preliminary Allocation of Tangible and Identifiable Intangible Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2017
Preliminary Allocation |  |  |
Goodwill | $ 129,244 |  | $ 80,216
Data Center Business |  |  |
Preliminary Allocation |  |  |
Accounts receivables | 33,488 | $ 33,488 |
Inventories | 19,934 | 19,973 |
Prepaid expenses and other current assets | 988 | 988 |
Property and equipment | 29,160 | 29,160 |
Other assets | 4,734 | 4,734 |
Accounts payable and accrued expenses | (15,737) | (15,850) |
Deferred revenue | (33,025) | (33,519) |
Total tangible assets acquired and liabilities assumed | 39,542 | 38,974 |
Identifiable intangible assets | 32,200 | 28,600 |
Goodwill | 12,595 | 16,763 |
Total intangible assets acquired | 44,795 | 45,363 |
Total net assets acquired | 84,337 | 84,337 |
Change during three months ended March 31, 2018 |  |  |
Adjustments, Inventory | (39) |  |
Adjustments, Accounts payable and accrued expenses | 113 |  |
Adjustments, Deferred revenue | 494 |  |
Adjustments, Net tangible assets acquired | 568 |  |
Adjustments, Identifiable intangible assets | 3,600 |  |
Adjustments, Goodwill | (4,168) |  |
Adjustments, Total intangible assets acquired | (568) |  |
Campus Fabric Business |  |  |
Preliminary Allocation |  |  |
Accounts receivables | 18,712 | 18,295 |
Inventories | 15,545 | 15,545 |
Prepaid expenses and other current assets | 649 | 673 |
Property and equipment | 5,406 | 3,768 |
Other assets | 4,794 | 5,311 |
Accounts payable and accrued expenses | (32,314) | (31,919) |
Deferred revenue | (8,994) | (10,051) |
Other long-term liabilities | (5,205) | (5,205) |
Total tangible assets acquired and liabilities assumed | (1,407) | (3,583) |
Identifiable intangible assets | 42,200 | 46,900 |
In-process research and development | 2,600 | 2,500 |
Goodwill | 36,433 | 34,009 |
Total intangible assets acquired | 81,233 | 83,409 |
Total net assets acquired | 79,826 | $ 79,826 |
Change during three months ended March 31, 2018 |  |  |
Adjustments, Accounts receivables | 417 |  |
Adjustments, Prepaid expenses and other current assets | (24) |  |
Adjustments, Property and equipment | 1,638 |  |
Adjustments, Other assets | (517) |  |
Adjustments, Accounts payable and accrued expenses | (395) |  |
Adjustments, Deferred revenue | 1,057 |  |
Adjustments, Net tangible assets acquired | 2,176 |  |
Adjustments, Identifiable intangible assets | (4,700) |  |
Adjustments, In-process research and development | 100 |  |
Adjustments, Goodwill | 2,424 |  |
Adjustments, Total intangible assets acquired | $ (2,176) |  |

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