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Summary of Significant Accounting Policies - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Contract Assets |  |
Balance at beginning of period | $ 30,116 |
Change due to acquisitions | 658 |
Change due to conditional versus unconditional | 5,454 |
Reclassified to unbilled accounts receivable | (28,980) |
Balance at June 30, 2018 | 7,248 |
Contract Liabilities |  |
Balance at beginning of period | 106,005 |
Change due to acquisitions | 3,126 |
Change in timing for performance obligation to be satisfied | 24,831 |
Balance at June 30, 2018 | 133,962 |
Increase (Decrease) In Income Taxes Abstract |  |
Decrease in the provision for income taxes | 2,800 |
Revenue related to our contract liabilities | $ 94,200 |
The term of the renewable service maintenance agreements (in years) | 1 year |
Practical Expedient | true |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |
Increase (Decrease) In Income Taxes Abstract |  |
Revenue related to our contract liabilities |  | $ 83,500

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