Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net (loss) income	$ (148,851)	$ (286,250)	$ 219,299
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization expense	56,809	60,038	57,237
Amortization of debt costs	13,160	12,698	6,421
Stock-based compensation	8,359	8,833	6,280
Long-lived asset impairments	457,794	476,553	28,333
Gains on refranchising	(384)	(19,112)	(7,580)
Gain on convertible debt exchange and debt financing costs	(10,996)	0	0
Deferred income tax (benefit) expense	(196,586)	(31,026)	450
Changes in assets and liabilities:
(Increase) decrease in receivables	(448)	11,053	422
Decrease (increase) in inventory	72,070	(33,496)	5,381
(Increase) decrease in prepaid and other current assets	(4,498)	(11,955)	776
(Decrease) increase in accounts payable	(23,960)	26,980	22,375
(Decrease) increase in deferred revenue and accrued liabilities	(6,712)	(8,282)	9,841
Other operating activities	4,751	2,164	5,298
Net cash provided by operating activities	220,508	208,198	354,533
Cash flows from investing activities:
Capital expenditures	(32,123)	(59,579)	(45,827)
Refranchising proceeds	3,983	39,177	3,374
Store acquisition costs	(1,989)	(2,018)	(3,196)
Proceeds from the sale of Lucky Vitamin	6,367	0	0
Net cash used in investing activities	(23,762)	(22,420)	(45,649)
Cash flows from financing activities:
Borrowings under Revolving Credit Facility	317,500	234,500	43,000
Payments on Revolving Credit Facility	(444,500)	(150,500)	0
Payments on Term Loan Facility	(40,853)	(4,550)	(169,060)
Proceeds from issuance of convertible senior notes	0	0	287,500
Debt issuance costs	0	(1,827)	(8,225)
Proceeds from exercise of stock options	0	353	1,743
Gross excess tax benefits from stock-based compensation	0	162	604
Minimum tax withholding requirements	(253)	(1,169)	(574)
Cash paid for treasury stock	0	(229,169)	(479,799)
Dividends paid to shareholders	0	(55,336)	(59,647)
Net cash used in financing activities	(168,106)	(207,536)	(384,458)
Effect of exchange rate changes on cash and cash equivalents	897	(240)	(1,798)
Net increase (decrease) in cash and cash equivalents	29,537	(21,998)	(77,372)
Beginning balance, cash and cash equivalents	34,464	56,462	133,834
Ending balance, cash and cash equivalents	64,001	34,464	56,462
Cash paid during the period for:
Income taxes	35,476	93,216	121,006
Interest	51,205	47,597	42,911
Non-cash Investing and Financing Items
Capital expenditures in current liabilities	1,683	7,556	6,018
Issuance of shares associated with exchange of convertible senior notes	$ 71,670	$ 0	$ 0