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	Sep. 30, 2018	Jan. 02, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 24,880	$ 26,624	$ 22,345
Accounts receivable, net	53,157	65,137	64,644
Notes receivable, net	6,466	4,333	4,333
Income tax receivable	11,051	3,903	3,903
Inventories	29,311	30,620	30,620
Prepaid expenses	20,106	23,563	28,522
Other current assets	7,400	9,494	9,494
Assets held for sale		6,133	6,133
Total current assets	152,371	169,807	169,994
Property and equipment, net	224,510	234,331	234,331
Notes receivable, less current portion, net	16,097	15,568	15,568
Goodwill	84,830	86,892	86,892
Deferred income taxes, net	700	585	585
Other assets	72,654	47,276	48,183
Total assets	551,162	554,459	555,553
Current liabilities:
Accounts payable	32,355	29,845	32,006
Income and other taxes payable	8,964	10,561	10,561
Accrued expenses and other current liabilities	100,081	86,153	70,293
Deferred revenue current	2,389	2,400
Current portion of long-term debt	20,000	20,000	20,000
Total current liabilities	163,789	148,959	132,860
Deferred revenue	14,946	13,450	2,652
Long-term debt, less current portion, net	555,755	446,565	446,565
Deferred income taxes, net	7,812	6,082	12,546
Other long-term liabilities	77,604	60,146	60,146
Total liabilities	819,906	675,202	654,769
Redeemable noncontrolling interests	5,979	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 44,299 at September 30, 2018 and 44,221 at December 31, 2017)	443	442	442
Additional paid-in capital	190,135	184,785	184,785
Accumulated other comprehensive income (loss)	3,605	(2,117)	(2,117)
Retained earnings	267,580	270,724	292,251
Treasury stock (12,933 shares at September 30, 2018 and 10,290 shares at December 31, 2017, at cost)	(751,895)	(597,072)	(597,072)
Total stockholders’ (deficit), net of noncontrolling interests	(290,132)	(143,238)	(121,711)
Noncontrolling interests in subsidiaries	15,409	15,757	15,757
Total stockholders’ (deficit)	(274,723)	(127,481)	(105,954)
Total liabilities, redeemable noncontrolling interests and stockholders’ (deficit)	$ 551,162	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	44,299		44,221
Treasury stock, shares	12,933		10,290
Accounting Standards Update 2014-09 | Total Adjustments
Current assets:
Cash and cash equivalents	$ (4,420)	4,279
Accounts receivable, net	(396)	493
Prepaid expenses	5,435	(4,959)
Total current assets	619	(187)
Other assets	907	(907)
Total assets	1,526	(1,094)
Current liabilities:
Accounts payable	799	(2,161)
Accrued expenses and other current liabilities	(16,743)	15,860
Deferred revenue current	(2,389)	2,400
Total current liabilities	(18,333)	16,099
Deferred revenue	(11,159)	10,798
Deferred income taxes, net	6,958	(6,464)
Total liabilities	(22,534)	20,433
Stockholders’ (deficit):
Retained earnings	24,018	(21,527)
Total stockholders’ (deficit), net of noncontrolling interests	24,018	(21,527)
Noncontrolling interests in subsidiaries	42
Total stockholders’ (deficit)	24,060	(21,527)
Total liabilities, redeemable noncontrolling interests and stockholders’ (deficit)	$ 1,526	$ (1,094)