CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Revenue	$ 261,758	$ 224,580
Provision for losses	81,031	61,736
Net revenue	180,727	162,844
Cost of providing services
Salaries and benefits	26,918	26,433
Occupancy	13,427	14,095
Office	6,981	4,868
Other costs of providing services	14,400	14,855
Advertising	9,756	7,688
Total cost of providing services	71,482	67,939
Gross margin	109,245	94,905
Operating expense
Corporate, district and other	40,454	32,993
Interest expense	22,349	23,366
Loss on extinguishment of debt	11,683	12,458
Total operating expense	74,486	68,817
Net income before income taxes	34,759	26,088
Provision for income taxes	11,467	9,450
Net income	$ 23,292	$ 16,638
Weighted average common shares outstanding:
Basic (in shares)	45,506	37,895
Diluted (in shares)	47,416	38,959
Net income per common share:
Basic earnings per share (in dollars per share)	$ 0.51	$ 0.44
Diluted earnings per share (in dollars per share)	$ 0.49	$ 0.43