Segment Reporting (Summary Of Cinema Exhibition Segment Revenue To Segment Operating Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	$ 210,527	$ 222,744	$ 203,115
Depreciation and amortization	(15,779)	(18,422)	(20,918)
Impairment expense	0	0	(1,549)
General and administrative expense	(20,161)	(20,172)	(21,416)
Operating income (loss)	(14,033)	(12,031)	(28,483)
Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	215,136	227,511	208,138
Operating expense	(193,229)	(200,948)	(192,738)
Depreciation and amortization	(15,392)	(17,711)	(19,846)
Impairment expense			(1,549)
General and administrative expense	(4,633)	(4,937)	(5,215)
Operating income (loss)	1,882	3,915	(11,210)
Cinema Exhibition [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	195,130	207,641	191,321
Operating expense	(183,986)	(192,185)	(183,791)
Depreciation and amortization	(10,232)	(11,335)	(13,351)
Impairment expense			(1,549)
General and administrative expense	(3,709)	(3,997)	(4,346)
Depreciation, amortization, general and administrative expense	(13,941)	(15,332)	(19,246)
Operating income (loss)	(2,797)	124	(11,716)
United States [Member] | Cinema Exhibition [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	99,938	113,798	97,083
Occupancy expense	(22,516)	(25,090)	(24,792)
Labor cost	(17,323)	(17,397)	(15,357)
Utilities	(5,973)	(6,856)	(7,087)
Cleaning and maintenance	(6,664)	(8,155)	(8,832)
Other operating expenses	(7,948)	(9,459)	(7,762)
Operating expense	(99,810)	(111,209)	(102,780)
Depreciation and amortization	(5,011)	(5,911)	(7,194)
Impairment expense			(1,549)
General and administrative expense	(2,368)	(2,502)	(2,749)
Depreciation, amortization, general and administrative expense	(7,379)	(8,413)	(11,492)
Operating income (loss)	(7,251)	(5,824)	(17,189)
United States [Member] | Admissions [Member] | Cinema Exhibition [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	55,782	63,662	53,495
United States [Member] | Concessions [Member] | Cinema Exhibition [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	34,314	38,884	33,859
United States [Member] | Film Rent And Advertising Cost [Member] | Cinema Exhibition [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating expense	(30,315)	(34,182)	(29,975)
United States [Member] | Food and Beverage [Member] | Cinema Exhibition [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating expense	(9,071)	(10,070)	(8,975)
United States [Member] | Advertising And Other [Member] | Cinema Exhibition [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	9,842	11,252	9,729
Australia [Member] | Cinema Exhibition [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	82,032	80,025	79,892
Occupancy expense	(18,086)	(17,207)	(17,356)
Labor cost	(14,040)	(13,243)	(13,037)
Utilities	(2,861)	(2,545)	(2,455)
Cleaning and maintenance	(5,069)	(4,696)	(4,574)
Other operating expenses	(3,597)	(3,313)	(2,895)
Operating expense	(71,918)	(68,427)	(68,002)
Depreciation and amortization	(4,763)	(4,824)	(5,348)
General and administrative expense	(1,325)	(1,495)	(1,597)
Depreciation, amortization, general and administrative expense	(6,088)	(6,319)	(6,945)
Operating income (loss)	4,026	5,279	4,945
Australia [Member] | Admissions [Member] | Cinema Exhibition [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	48,186	48,630	48,734
Australia [Member] | Concessions [Member] | Cinema Exhibition [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	27,670	26,119	26,276
Australia [Member] | Film Rent And Advertising Cost [Member] | Cinema Exhibition [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating expense	(22,124)	(21,814)	(22,281)
Australia [Member] | Food and Beverage [Member] | Cinema Exhibition [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating expense	(6,141)	(5,609)	(5,404)
Australia [Member] | Advertising And Other [Member] | Cinema Exhibition [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	6,176	5,276	4,882
New Zealand [Member] | Cinema Exhibition [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	13,160	13,818	14,346
Occupancy expense	(3,106)	(3,081)	(3,140)
Labor cost	(2,385)	(2,417)	(2,526)
Utilities	(394)	(435)	(464)
Cleaning and maintenance	(886)	(971)	(923)
Other operating expenses	(1,066)	(876)	(1,051)
Operating expense	(12,258)	(12,549)	(13,009)
Depreciation and amortization	(458)	(600)	(809)
General and administrative expense	(16)
Depreciation, amortization, general and administrative expense	(474)	(600)	(809)
Operating income (loss)	428	669	528
New Zealand [Member] | Admissions [Member] | Cinema Exhibition [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	7,663	8,509	8,841
New Zealand [Member] | Concessions [Member] | Cinema Exhibition [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	4,375	4,585	4,728
New Zealand [Member] | Film Rent And Advertising Cost [Member] | Cinema Exhibition [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating expense	(3,474)	(3,858)	(3,990)
New Zealand [Member] | Food and Beverage [Member] | Cinema Exhibition [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating expense	(947)	(911)	(915)
New Zealand [Member] | Advertising And Other [Member] | Cinema Exhibition [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenue	$ 1,122	$ 724	$ 777