Basis of Presentation Basis of Presentation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 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	$ (311,484)		$ (311,484)		$ (299,683)	$ (298,018)
Deferred tax liability	116,642		116,642		86,727	87,081
Total Liabilities	(1,097,950)		(1,097,950)		(1,149,649)	(1,148,338)
Retained earnings	791,344		791,344		797,432	798,743
Total Stockholders' Equity	268,337		268,337		$ 271,132	272,443
Royalty income and fees	3,812	$ 2,061	7,163	$ 4,181
Total revenues	655,730	677,635	1,353,773	1,419,621
Gross profit	423,886	432,533	860,864	895,196
Other store expenses	156,854	177,050	342,803	374,490
Total operating expenses	396,735	433,406	843,983	894,917
Operating profit (loss)	27,151	(873)	16,881	279
Earnings (loss) before income taxes	16,547	(13,913)	(4,874)	(24,235)
Income tax expense (benefit)	2,794	(5,020)	1,216	(8,663)
Net earnings (loss)	13,753	$ (8,893)	(6,090)	$ (15,572)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accrued Liabilities	(2,602)		(2,602)			(1,665)
Deferred tax liability	417		417			354
Total Liabilities	(2,185)		(2,185)			(1,311)
Retained earnings	2,185		2,185			1,311
Total Stockholders' Equity	2,185		2,185			$ 1,311
Royalty income and fees	(978)		(1,042)
Total revenues	(978)		(1,042)
Gross profit	(978)		(1,042)
Other store expenses	(912)		(1,979)
Total operating expenses	(912)		(1,979)
Operating profit (loss)	(66)		937
Earnings (loss) before income taxes	(66)		937
Income tax expense (benefit)	(11)		63
Net earnings (loss)	(55)		874
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accrued Liabilities	(308,882)		(308,882)
Deferred tax liability	117,059		117,059
Total Liabilities	(1,095,765)		(1,095,765)
Retained earnings	793,529		793,529
Total Stockholders' Equity	270,522		270,522
Royalty income and fees	2,834		6,121
Total revenues	654,752		1,352,731
Gross profit	422,908		859,822
Other store expenses	155,942		340,824
Total operating expenses	395,823		842,004
Operating profit (loss)	27,085		17,818
Earnings (loss) before income taxes	16,481		(3,937)
Income tax expense (benefit)	2,783		1,279
Net earnings (loss)	$ 13,698		$ (5,216)