Consolidated statements of cash flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net income	$ 103,162	$ 55,601	$ 71,247
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	35,260	31,761	31,502
Amortization of deferred financing costs	3,400	1,935	1,544
Amortization of favorable leases and asset retirement obligations	375	334	392
Amortization and settlement of interest rate caps	1,170	1,755	797
Deferred tax expense	23,933	372,422	15,606
Loss (gain) on re-measurement of tax benefit arrangement	4,765	(317,354)	72
Provision for bad debts	19	(19)	59
Loss (gain) on disposal of property and equipment	462	(159)	(514)
Loss on extinguishment of debt	4,570	79	606
Third party debt refinancing expense	0	1,021	3,001
Loss on reacquired franchise rights	360	0	0
Equity-based compensation	5,479	2,531	1,728
Changes in operating assets and liabilities:
Accounts receivable	(1,923)	(10,481)	(7,754)
Due from related parties	3,598	(604)	1,897
Inventory	(2,430)	(890)	2,755
Other assets and other current assets	5,778	(2,981)	(7,944)
Accounts payable and accrued expenses	14,506	4,210	7,428
Other liabilities and other current liabilities	(2,835)	(470)	2,747
Income taxes	194	(3,027)	(5,993)
Payments pursuant to tax benefit arrangements	(30,493)	(11,446)	(6,922)
Equipment deposits	1,410	4,328	(3,417)
Deferred revenue	9,640	1,276	(652)
Deferred rent	3,999	1,199	632
Net cash provided by operating activities	184,399	131,021	108,817
Cash flows from investing activities:
Additions to property and equipment	(40,860)	(37,722)	(15,377)
Acquisitions of franchises	(45,752)	0	0
Proceeds from sale of property and equipment	196	680	683
Net cash used in investing activities	(86,416)	(37,042)	(14,694)
Cash flows from financing activities:
Proceeds from issuance of long-term debt	1,200,000	0	230,000
Proceeds from issuance of Class A common stock	1,209	480	136
Principal payments on capital lease obligations	(47)	(22)	(46)
Repayment of long-term debt	(712,469)	(7,185)	(5,621)
Payment of deferred financing and other debt-related costs	(27,133)	(1,278)	(5,220)
Premiums paid for interest rate caps	0	(366)	0
Dividend paid to holders of Class A common stock	0	0	(169,282)
Dividend equivalent paid to members of Pla-Fit Holdings	(957)	(1,974)	(101,729)
Distributions to members of Pla-Fit Holdings	(8,300)	(11,358)	(31,838)
Net cash provided by (used in) financing activities	109,920	(21,703)	(85,183)
Effects of exchange rate changes on cash and cash equivalents	(844)	411	23
Net increase in cash, cash equivalents and restricted cash	207,059	72,687	8,963
Cash, cash equivalents and restricted cash, beginning of period	113,080	40,393	31,430
Cash, cash equivalents and restricted cash, end of period	320,139	113,080	40,393
Supplemental cash flow information:
Net cash paid for income taxes	5,016	3,722	7,040
Cash paid for interest	38,624	31,418	24,302
Non-cash investing activities:
Non-cash additions to property and equipment	5,451	861	2,203
Non-cash financing activities:
Non-cash dividend equivalent payments	0	0	3,899
Class A Common Stock
Cash flows from financing activities:
Repurchase and retirement of common stock	(342,383)	0	0
Class B Common Stock
Cash flows from financing activities:
Repurchase and retirement of common stock	$ 0	$ 0	$ (1,583)