Quarterly Financial Information (Unaudited) - (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Revenues		$ 794,954	$ 768,982	$ 789,353	$ 854,427	$ 821,199	$ 767,694	$ 769,049	$ 821,814	$ 3,207,716	$ 3,179,756	$ 2,695,033
Gross Profit	[1]	339,599	332,487	352,576	374,268	344,144	331,628	346,110	363,478
Earnings Before Income Taxes		32,288	45,282	61,124	79,728	34,380	36,556	64,354	77,830	218,422	213,120	121,704
Net Earnings		$ 21,631	$ 29,464	$ 38,501	$ 49,687	$ 21,726	$ 24,194	$ 40,546	$ 49,243	$ 139,283	$ 135,709	$ 78,233
Earnings Per Share (in dollars per share)		$ 0.30	$ 0.41	$ 0.53	$ 0.68	$ 0.30	$ 0.33	$ 0.56	$ 0.68	$ 1.93	$ 1.87	$ 1.08
Earnings Per Share Assuming Dilution (in dollars per share)		$ 0.30	$ 0.40	$ 0.53	$ 0.68	$ 0.30	$ 0.33	$ 0.56	$ 0.68	$ 1.91	$ 1.86	$ 1.08

[1] Gross profit is the sum of lease revenues and fees, retail sales, non-retail sales, and interest and fees on loans receivable less retail cost of sales, non-retail cost of sales, depreciation of lease merchandise, provision for write-offs of lease merchandise, and provision for credit losses.