Adoption of ASU 2014-09, "Revenue from Contracts with Customers" – Line Items Impacted by Cumulative Adjustment (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	Jul. 01, 2018	Jan. 02, 2018	Dec. 31, 2017	Jun. 25, 2017	Dec. 25, 2016
Current assets:
Cash and cash equivalents	$ 25,719	$ 26,624	$ 22,345	$ 22,247	$ 15,563
Accounts receivable, net	62,973	65,137	64,644
Notes receivable, net	5,180	4,333	4,333
Income tax receivable		3,903	3,903
Inventories	27,109	30,620	30,620
Prepaid expenses	26,729	23,563	28,522
Other current assets	7,223	9,494	9,494
Assets held for sale	2,786	6,133	6,133
Total current assets	157,719	169,807	169,994
Property and equipment, net	227,722	234,331	234,331
Notes receivable, less current portion, net	15,648	15,568	15,568
Goodwill	85,064	86,892	86,892
Deferred income taxes, net	709	585	585
Other assets	71,309	47,276	48,183
Total assets	558,171	554,459	555,553
Current liabilities:
Accounts payable	33,307	29,845	32,006
Income and other taxes payable	8,904	10,561	10,561
Accrued expenses and other current liabilities	81,197	86,153	70,293
Deferred revenue current	2,426	2,400
Current portion of long-term debt	20,000	20,000	20,000
Total current liabilities	145,834	148,959	132,860
Deferred revenue	15,329	13,450	2,652
Long-term debt, less current portion, net	556,387	446,565	446,565
Deferred income taxes, net	5,140	6,082	12,546
Other long-term liabilities	78,515	60,146	60,146
Total liabilities	801,205	675,202	654,769
Redeemable noncontrolling interests	7,356	6,738	6,738
Stockholders’ (deficit):
Preferred stock ($0.01 par value per share; no shares issued)
Common stock ($0.01 par value per share; issued 44,280 at July 1, 2018 and 44,221 at December 31, 2017)	443	442	442
Additional paid-in capital	188,026	184,785	184,785
Accumulated other comprehensive income (loss)	2,240	(2,117)	(2,117)
Retained earnings	285,460	270,724	292,251
Treasury stock (12,733 shares at July 1, 2018 and 10,290 shares at December 31, 2017, at cost)	(742,695)	(597,072)	(597,072)
Total stockholders’ (deficit), net of noncontrolling interests	(266,526)	(143,238)	(121,711)
Noncontrolling interests in subsidiaries	16,136	15,757	15,757
Total stockholders’ (deficit)	(250,390)	(127,481)	(105,954)
Total liabilities, redeemable noncontrolling interests and stockholders’ (deficit)	$ 558,171	554,459	$ 555,553
Preferred stock, par value	$ 0.01		$ 0.01
Preferred stock, shares issued	0		0
Common stock, par value	$ 0.01		$ 0.01
Common stock, shares issued	44,280		44,221
Treasury stock, shares	12,733		10,290
Accounting Standards Update 2014-09 | Total Adjustments
Current assets:
Cash and cash equivalents	$ (3,130)	4,279
Accounts receivable, net	(359)	493
Prepaid expenses	4,827	(4,959)
Total current assets	1,338	(187)
Other assets	907	(907)
Total assets	2,245	(1,094)
Current liabilities:
Accounts payable	1,493	(2,161)
Accrued expenses and other current liabilities	(15,457)	15,860
Deferred revenue current	(2,426)	2,400
Total current liabilities	(16,390)	16,099
Deferred revenue	(11,157)	10,798
Deferred income taxes, net	6,682	(6,464)
Total liabilities	(20,865)	20,433
Stockholders’ (deficit):
Retained earnings	23,091	(21,527)
Total stockholders’ (deficit), net of noncontrolling interests	23,091	(21,527)
Noncontrolling interests in subsidiaries	19
Total stockholders’ (deficit)	23,110	(21,527)
Total liabilities, redeemable noncontrolling interests and stockholders’ (deficit)	$ 2,245	$ (1,094)