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v3.19.2

Summary of Significant Accounting Policies - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Contract Assets |  |  |
Balance at beginning of period | $ 10,213 | $ 30,116 | $ 30,116
Change due to acquisitions | 6,953 |  | 2,833
Change due to conditional versus unconditional | 8,945 |  | (6,244)
Reclassified to unbilled accounts receivable |  |  | (28,980)
Balance at end of period | 8,221 |  | 10,213
Contract Liabilities |  |  |
Balance at beginning of period | 130,986 | 106,005 | 106,005
Change due to acquisitions | 31,604 |  | 8,195
Change in timing for performance obligation to be satisfied | 2,699 |  | 16,786
Balance at end of period | 165,289 |  | $ 130,986
Increase (Decrease) In Income Taxes Abstract |  |  |
Revenue related to our contract liabilities | 109,700 |  |
Impairment losses | $ 0 | 0 |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |
Increase (Decrease) In Income Taxes Abstract |  |  |
Revenue related to our contract liabilities |  | $ 94,200 |

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