Quarterly Financial Information (Unaudited) - Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Revenues		$ 821,199	$ 767,694	$ 769,049	$ 821,814	$ 748,702	$ 698,418	$ 662,490	$ 585,423	$ 3,179,756	$ 2,695,033	$ 2,234,631
Gross Profit	[1]	344,144	331,628	346,110	363,478	320,797	313,540	309,385	292,393
Earnings Before Income Taxes		34,380	36,556	64,354	77,830	34,233	13,199	13,562	60,710	213,120	121,704	184,960
Net Earnings		$ 21,726	$ 24,194	$ 40,546	$ 49,243	$ 22,094	$ 9,295	$ 8,505	$ 38,339	$ 135,709	$ 78,233	$ 120,666
Earnings Per Share (in dollars per share)		$ 0.30	$ 0.33	$ 0.56	$ 0.68	$ 0.30	$ 0.13	$ 0.12	$ 0.53	$ 1.87	$ 1.08	$ 1.59
Earnings Per Share Assuming Dilution (in dollars per share)		$ 0.30	$ 0.33	$ 0.56	$ 0.68	$ 0.30	$ 0.13	$ 0.12	$ 0.53	$ 1.86	$ 1.08	$ 1.58

[1] Gross profit is the sum of lease revenues and fees, retail sales and non-retail sales less retail cost of sales, non-retail cost of sales, depreciation of lease merchandise and write-offs of lease merchandise