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Summary of Significant Accounting Policies - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
	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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