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Acquisitions - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed on Preliminary Purchase Price Allocation (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019 | Jul. 31, 2019 | Jan. 07, 2019
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Contract assets | $ 626,513 | $ 575,089 |  |
Goodwill | 1,044,014 | 1,047,425 |  |
Contract liabilities | $ (241,178) | $ (230,681) |  |
OGSystems |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash and cash equivalents |  |  |  | $ 5,772
Accounts receivable |  |  |  | 9,904
Contract assets |  |  |  | 9,747
Prepaid expenses and other current assets |  |  |  | 4,307
Property and equipment |  |  |  | 4,085
Right of use assets, operating leases |  |  |  | 8,826
Goodwill |  |  |  | 183,540
Intangible assets |  |  |  | 92,300
Other noncurrent assets |  |  |  | 10
Accounts payable |  |  |  | (5,450)
Accrued expenses and other current liabilities |  |  |  | (7,147)
Contract liabilities |  |  |  | (1,300)
Short-term lease liabilities, operating leases |  |  |  | (805)
Income tax payable |  |  |  | (1,178)
Deferred tax liabilities |  |  |  | (1,195)
Long-term lease liabilities, operating leases |  |  |  | (8,021)
Other long-term liabilities |  |  |  | (1,015)
Net assets acquired |  |  |  | $ 292,380
QRC Technologies |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash and cash equivalents |  |  | $ 5,925 |
Accounts receivable |  |  | 5,587 |
Prepaid expenses and other current assets |  |  | 5,727 |
Property and equipment |  |  | 1,205 |
Right of use assets, operating leases |  |  | 5,228 |
Goodwill |  |  | 125,091 |
Intangible assets |  |  | 76,200 |
Accounts payable |  |  | (1,567) |
Accrued expenses and other current liabilities |  |  | (4,025) |
Short-term lease liabilities, operating leases |  |  | (545) |
Long-term lease liabilities, operating leases |  |  | (4,683) |
Net assets acquired |  |  | $ 214,143 |

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