Condensed consolidated statements of operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue:
Revenue	$ 166,815	$ 136,656	$ 497,292	$ 398,538
Operating costs and expenses:
Cost of revenue	46,194	36,871	135,071	100,114
Store operations	22,295	18,751	63,363	55,154
Selling, general and administrative	20,928	17,233	57,944	52,066
National advertising fund expense	12,652	11,377	36,986	32,997
Depreciation and amortization	11,832	8,863	32,316	25,947
Other (gain) loss	(147)	(12)	99	958
Total operating costs and expenses	113,754	93,083	325,779	267,236
Income from operations	53,061	43,573	171,513	131,302
Other expense, net:
Interest income	1,808	2,025	5,585	2,480
Interest expense	(14,807)	(17,909)	(44,192)	(35,725)
Other expense	(61)	(27)	(4,824)	(338)
Total other expense, net	(13,060)	(15,911)	(43,431)	(33,583)
Income before income taxes	40,001	27,662	128,082	97,719
Provision for income taxes	10,309	7,190	26,924	23,335
Net income	29,692	20,472	101,158	74,384
Less net income attributable to non-controlling interests	3,915	3,001	13,128	11,158
Net income attributable to Planet Fitness, Inc.	$ 25,777	$ 17,471	$ 88,030	$ 63,226
Class A Common Stock
Net income per share of Class A common stock:
Basic (in dollars per share)	$ 0.31	$ 0.20	$ 1.05	$ 0.72
Diluted (in dollars per share)	$ 0.31	$ 0.20	$ 1.04	$ 0.72
Weighted-average shares of Class A common stock outstanding:
Basic (in shares)	83,157,430	88,047,401	83,699,609	87,727,300
Diluted (in shares)	83,806,906	88,457,804	84,354,172	88,064,051
Franchise
Revenue:
Revenue	$ 53,443	$ 41,997	$ 164,624	$ 129,575
Commission income
Revenue:
Revenue	614	1,448	2,673	5,012
National advertising fund
Revenue:
Revenue	12,652	11,377	36,986	32,997
Corporate-owned stores
Revenue:
Revenue	40,742	35,406	118,481	102,365
Equipment
Revenue:
Revenue	$ 59,364	$ 46,428	$ 174,528	$ 128,589