Basis of Presentation Basis of Presentation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated cash to be received by shareholders, per share	$ 15.00		$ 15.00
Accrued Liabilities	$ (311,277)		$ (311,277)		$ (299,683)	$ (298,018)
Deferred tax liability	119,288		119,288		86,727	87,081
Total Liabilities	(1,068,347)		(1,068,347)		(1,149,649)	(1,148,338)
Retained earnings	804,260		804,260		797,432	798,743
Total Stockholders' Equity	283,746		283,746		271,132	$ 272,443
Royalty income and fees	3,265	$ 1,996	10,428	$ 6,177
Total revenues	644,942	643,965	1,998,715	2,063,586
Gross profit	407,740	412,465	1,268,604	1,307,661
Other store expenses	149,326	171,995	492,129	546,485
Total operating expenses	382,108	420,910	1,226,091	1,315,827
Operating profit (loss)	25,632	(8,445)	42,513	(8,166)
Earnings (loss) before income taxes	15,481	(19,721)	10,607	(43,956)
Income tax expense (benefit)	2,563	(7,122)	3,779	(15,785)
Net earnings (loss)	12,918	$ (12,599)	6,828	$ (28,171)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accrued Liabilities	(2,541)		(2,541)		(1,665)
Deferred tax liability	407		407		354
Total Liabilities	(2,134)		(2,134)		(1,311)
Retained earnings	2,134		2,134		1,311
Total Stockholders' Equity	2,134		2,134		$ 1,311
Royalty income and fees	(1,129)		(2,171)
Total revenues	(1,129)		(2,171)
Gross profit	(1,129)		(2,171)
Other store expenses	(1,068)		(3,047)
Total operating expenses	(1,068)		(3,047)
Operating profit (loss)	(61)		876
Earnings (loss) before income taxes	(61)		876
Income tax expense (benefit)	(10)		53
Net earnings (loss)	(51)		823
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accrued Liabilities	(308,736)		(308,736)
Deferred tax liability	119,695		119,695
Total Liabilities	(1,066,213)		(1,066,213)
Retained earnings	806,394		806,394
Total Stockholders' Equity	285,880		285,880
Royalty income and fees	2,136		8,257
Total revenues	643,813		1,996,544
Gross profit	406,611		1,266,433
Other store expenses	148,258		489,082
Total operating expenses	381,040		1,223,044
Operating profit (loss)	25,571		43,389
Earnings (loss) before income taxes	15,420		11,483
Income tax expense (benefit)	2,553		3,832
Net earnings (loss)	$ 12,867		$ 7,651