Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Tour revenues	$ 87,242	$ 84,584	$ 239,125	$ 203,283
Cost of tours	44,964	38,480	114,645	99,780
Gross profit	42,278	46,104	124,480	103,503
Operating expenses:
General and administrative	14,718	16,526	45,647	46,710
Selling and marketing	12,255	11,676	34,911	31,521
Depreciation and amortization	5,024	4,354	15,062	12,012
Total operating expenses	31,997	32,556	95,620	90,243
Operating income	10,281	13,548	28,860	13,260
Other (expense) income:
Interest expense, net	(2,409)	(2,802)	(8,013)	(7,192)
Gain (loss) on foreign currency	163	224	(1,430)	1,047
Other income (expense)	1	59	(118)	(97)
Total other expense	(2,245)	(2,519)	(9,561)	(6,242)
Income before income taxes	8,036	11,029	19,299	7,018
Income tax expense (benefit)	2,690	1,586	3,194	(473)
Net income	5,346	9,443	16,105	7,491
Net income attributable to noncontrolling interest	279	165	107	149
Net income available to common stockholders	$ 5,067	$ 9,278	$ 15,998	$ 7,342
Weighted average shares outstanding
Basic	45,423,127	44,457,656	45,356,438	44,528,878
Diluted	47,690,395	45,718,513	45,963,669	45,609,560
Net income per share available to common stockholders
Basic	$ 0.11	$ 0.21	$ 0.35	$ 0.16
Diluted	$ 0.11	$ 0.2	$ 0.35	$ 0.16