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Summary of Significant Accounting Policies - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Contract Assets |  |  |
Balance at beginning of period | $ 10,213 | $ 30,116 | $ 30,116
Change due to acquisitions | 27 |  | 2,833
Change due to conditional versus unconditional | (1,954) |  | 6,244
Reclassified to unbilled accounts receivable |  |  | (28,980)
Balance at end of period | 8,286 |  | 10,213
Contract Liabilities |  |  |
Balance at beginning of period | 130,986 | 106,005 | 106,005
Change due to acquisitions | 44 |  | 8,195
Change in timing for performance obligation to be satisfied | (10,740) |  | 16,786
Balance at end of period | 120,290 |  | $ 130,986
Revenue related to our contract liabilities | 105,600 |  |
Impairment losses | $ 0 | 0 |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |
Contract Liabilities |  |  |
Revenue related to our contract liabilities |  | $ 85,500 |

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