Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities
Net income	$ 29,009	$ 11,941
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	6,118	4,420
Amortization of debt issuance costs	63	85
Net loss on disposition of property and equipment	3	15
Stock-based compensation expense	4,817	289
Deferred income taxes, net	(4,936)	(230)
Changes in operating assets and liabilities:
Accounts receivable	(421)	242
Prepaid expenses	(605)	(1,260)
Inventory	652	(131)
Deposits and other assets	350	(373)
Accounts payable	2,619	(970)
Income taxes, net	12,114	2,866
Accrued commissions and bonuses	(5,635)	(2,541)
Accrued payroll and vacation	3,640	3,382
Deferred revenue	4,675	3,698
Accrued expenses and other current liabilities	2,091	1,346
Net cash provided by operating activities	54,554	22,779
Cash flows from investing activities
(Increase) decrease in funds held for clients	(337,611)	117,750
Decrease in restricted cash		371
Purchases of property and equipment	(24,340)	(4,922)
Net cash (used in) provided by investing activities	(361,951)	113,199
Cash flows from financing activities
Proceeds from issuance of long-term debt	3,903
Repurchases of common stock	(3,490)
Principal payments on long-term debt	(448)	(682)
Increase (decrease) in client funds obligation	337,611	(117,750)
Payment of debt issuance costs		(23)
Net cash provided by (used in) financing activities	337,576	(118,455)
Change in cash and cash equivalents	30,179	17,523
Cash and cash equivalents
Beginning of period	50,714	25,144
End of period	$ 80,893	$ 42,667