Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income	$ 9,167	$ 9,388
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	4,575	5,995
Bad debt expense	464	343
Equity-based compensation expense	1,268	562
Deferred income tax expense	478	1,178
Fair value adjustments to contingent consideration	135	130
Payments pursuant to tax receivable agreements		(1,931)
Other, net	99	115
Changes in operating assets and liabilities	(2,614)	(1,685)
Net cash provided by operating activities	13,572	14,095
Cash flows from investing activities:
Purchases of property, equipment and software	(691)	(657)
Acquisitions	(26,250)
Net cash used in investing activities	(26,941)	(657)
Cash flows from financing activities:
Payments on debt	(592)	(592)
Distributions paid to non-controlling unitholders	(2,521)	(2,281)
Dividends and dividend equivalents paid to Class A common stockholders	(3,595)	(3,184)
Payment of payroll taxes related to net settled restricted stock units	(564)	(450)
Payment of contingent consideration	(50)
Net cash used in financing activities	(7,322)	(6,507)
Effect of exchange rate changes on cash	(13)	98
Net (decrease) increase in cash and cash equivalents	(20,704)	7,029
Cash and cash equivalents, beginning of year	50,807	57,609
Cash and cash equivalents, end of period	30,103	64,638
Supplemental disclosures of cash flow information:
Cash paid for interest	2,585	2,600
Net cash paid for income taxes	1,217	1,008
Schedule of non-cash investing and financing activities:
Tax and other distributions payable to non-controlling unitholders	1,691	3,568
Increase in accounts payable for capitalization of trademark costs and purchases of property, equipment and software	$ 206	$ 134