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Business Combinations - Total Purchase Price and Identifiable Intangible Assets (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2015 | Apr. 30, 2015 | Apr. 21, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  |  | $ 327,724 | $ 147,906 | $ 122,720
Total purchase price, net of cash received |  |  |  | 312,158 | 25,507 | $ 20,723
Aesynt |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash |  |  |  | 8,164 |  |
Accounts receivable |  |  |  | 43,312 |  |
Inventory |  |  |  | 19,021 |  |
Other current assets |  |  |  | 3,787 |  |
Total current assets |  |  |  | 74,284 |  |
Property and equipment |  |  |  | 10,389 |  |
Intangibles |  |  |  | 123,700 |  |
Goodwill |  |  |  | 163,599 |  |
Other non-current assets |  |  |  | 968 |  |
Total assets |  |  |  | 372,940 |  |
Current liabilities |  |  |  | 26,753 |  |
Deferred revenue, net |  |  |  | 25,512 |  |
Long-term deferred tax liabilities |  |  |  | 38,622 |  |
Other non-current liabilities |  |  |  | 2,431 |  |
Total liabilities |  |  |  | 93,318 |  |
Total purchase price |  |  |  | 279,622 |  |
Total purchase price, net of cash received |  |  |  | 271,500 |  |
Ateb |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash |  |  |  | 902 |  |
Accounts receivable |  |  |  | 7,905 |  |
Inventory |  |  |  | 225 |  |
Other current assets |  |  |  | 1,239 |  |
Total current assets |  |  |  | 10,271 |  |
Property and equipment |  |  |  | 2,447 |  |
Intangibles |  |  |  | 12,500 |  |
Goodwill |  |  |  | 20,832 |  |
Other non-current assets |  |  |  | 1,009 |  |
Total assets |  |  |  | 47,059 |  |
Current liabilities |  |  |  | 2,314 |  |
Deferred revenue, net |  |  |  | 2,776 |  |
Long-term deferred tax liabilities |  |  |  | 0 |  |
Other non-current liabilities |  |  |  | 367 |  |
Total liabilities |  |  |  | 5,457 |  |
Total purchase price |  |  |  | 41,602 |  |
Total purchase price, net of cash received |  |  |  | 40,700 |  |
Aesynt and Ateb |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash |  |  |  | 9,066 |  |
Accounts receivable |  |  |  | 51,217 |  |
Inventory |  |  |  | 19,246 |  |
Other current assets |  |  |  | 5,026 |  |
Total current assets |  |  |  | 84,555 |  |
Property and equipment |  |  |  | 12,836 |  |
Intangibles |  |  |  | 136,200 |  |
Goodwill |  |  |  | 184,431 |  |
Other non-current assets |  |  |  | 1,977 |  |
Total assets |  |  |  | 419,999 |  |
Current liabilities |  |  |  | 29,067 |  |
Deferred revenue, net |  |  |  | 28,288 |  |
Long-term deferred tax liabilities |  |  |  | 38,622 |  |
Other non-current liabilities |  |  |  | 2,798 |  |
Total liabilities |  |  |  | 98,775 |  |
Total purchase price |  |  |  | 321,224 |  |
Total purchase price, net of cash received |  |  |  | $ 312,158 |  |
Mach4 |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash |  |  | $ 397 |  |  |
Accounts receivable |  |  | 3,743 |  |  |
Inventory |  |  | 3,580 |  |  |
Deferred tax assets and other current assets |  |  | 368 |  |  |
Total current assets |  |  | 8,088 |  |  |
Property and equipment |  |  | 463 |  |  |
Intangibles |  |  | 7,710 |  | 7,710 |
Goodwill |  |  | 10,591 |  |  |
Other non-current assets |  |  | 52 |  |  |
Total assets |  |  | 26,904 |  |  |
Current liabilities |  |  | 3,684 |  |  |
Long-term deferred tax liabilities |  |  | 2,564 |  |  |
Deferred service revenue and gross profit |  |  | 2,314 |  |  |
Other non-current liabilities |  |  | 1,056 |  |  |
Total liabilities |  |  | 9,618 |  |  |
Total purchase price |  |  | 17,286 |  |  |
Total purchase price, net of cash received |  |  | $ 16,889 |  |  |
Avantec |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash | $ 3,392 | $ 3,392 |  |  |  |
Accounts receivable | 3,607 | 3,607 |  |  |  |
Inventory | 1,428 | 1,428 |  |  |  |
Deferred tax assets and other current assets | 89 | 89 |  |  |  |
Total current assets | 8,516 | 8,516 |  |  |  |
Property and equipment | 0 | 0 |  |  |  |
Intangibles | 6,341 | 6,341 |  |  | $ 6,341 |
Goodwill | 15,606 | 15,606 |  |  |  |
Other non-current assets | 0 | 0 |  |  |  |
Total assets | 30,463 | 30,463 |  |  |  |
Current liabilities | 4,125 | 4,125 |  |  |  |
Long-term deferred tax liabilities | 1,269 | 1,269 |  |  |  |
Deferred service revenue and gross profit | 928 | 928 |  |  |  |
Other non-current liabilities | 0 | 0 |  |  |  |
Total liabilities | 6,322 | 6,322 |  |  |  |
Total purchase price | 24,141 | 24,141 |  |  |  |
Total purchase price, net of cash received |  | 20,749 |  |  |  |
2015 Acquisitions Mach4 and Avantec [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash | 3,789 | 3,789 |  |  |  |
Accounts receivable | 7,350 | 7,350 |  |  |  |
Inventory | 5,008 | 5,008 |  |  |  |
Deferred tax assets and other current assets | 457 | 457 |  |  |  |
Total current assets | 16,604 | 16,604 |  |  |  |
Property and equipment | 463 | 463 |  |  |  |
Intangibles | 14,051 | 14,051 |  |  |  |
Goodwill | 26,197 | 26,197 |  |  |  |
Other non-current assets | 52 | 52 |  |  |  |
Total assets | 57,367 | 57,367 |  |  |  |
Current liabilities | 7,809 | 7,809 |  |  |  |
Long-term deferred tax liabilities | 3,833 | 3,833 |  |  |  |
Deferred service revenue and gross profit | 3,242 | 3,242 |  |  |  |
Other non-current liabilities | 1,056 | 1,056 |  |  |  |
Total liabilities | 15,940 | 15,940 |  |  |  |
Total purchase price | 41,427 | $ 41,427 |  |  |  |
Total purchase price, net of cash received | $ 37,638 |  |  |  |  |

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