Revenue (Tables)

3 Months Ended

Mar. 31, 2018

Revenue From Contract With Customer [Abstract]

Summary of Disaggregates Major Categories of Revenues

. The following table, consistent with our Consolidated Statements of Income, disaggregates revenue by recurring and implementation and other revenue which we believe represents the major categories of revenues (in thousands):

	Three Months Ended March 31,
	2018		2017
Revenues
Recurring	$	151,885	$	117,914
Implementation and other		2,031		1,594
Total revenues	$	153,916	$	119,508

Summary of Changes in Deferred Revenue Related to Material Right Performance Obligations

Changes in deferred revenue related to material right performance obligations were as follows (in thousands):  

	Three Months Ended
	March 31, 2018
Balance, beginning of period	$	51,624
Deferral of revenue		3,943
Recognition of unearned revenue		(1,790	)
Balance, end of period	$	53,777

Summary of Asset Balances and Related Amortization Expense For Contract Costs

The following table presents the asset balances and related amortization expense for these contract costs (in thousands):

	As of and for the Three Months Ended March 31, 2018
	Beginning		Capitalization					Ending
	Balance		of Costs		Amortization			Balance
Costs to obtain a contract	$	126,207	$	15,122	$	(4,418	)	$	136,911
Costs to fulfill a contract	$	72,061	$	11,043	$	(2,515	)	$	80,589