Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Condensed Consolidated Statements of Operations and Comprehensive Income [Abstract]
Revenues	$ 253,229	$ 236,775	$ 492,144	$ 457,513
Operating expenses:
Operating costs	139,216	132,746	274,199	266,624
Selling, general and administrative	51,771	43,048	101,080	86,126
Casualty loss	372	469	546	468
Preopening costs	8	41	339	41
Depreciation and amortization	30,254	29,271	62,688	58,328
Operating income	31,608	31,200	53,292	45,926
Interest expense, net of amounts capitalized	(14,451)	(21,377)	(28,813)	(42,186)
Interest income	3,021	3,316	6,175	6,489
Income from unconsolidated companies	109	152	109	325
Other gains and (losses), net		141		(50)
Income before income taxes and discontinued operations	20,287	13,432	30,763	10,504
Provision for income taxes	(11,314)	(4,799)	(15,783)	(3,832)
Income from continuing operations	8,973	8,633	14,980	6,672
Income from discontinued operations, net of income taxes	(19)	4	2	8
Net income	8,954	8,637	14,982	6,680
Basic income per share:
Income from continuing operations	$ 0.18	$ 0.18	$ 0.31	$ 0.14
Income from discontinued operations, net of income taxes
Net income	$ 0.18	$ 0.18	$ 0.31	$ 0.14
Fully diluted income per share:
Income from continuing operations	$ 0.17	$ 0.17	$ 0.29	$ 0.13
Income (loss) from discontinued operations, net of income taxes
Net income	$ 0.17	$ 0.17	$ 0.29	$ 0.13
Comprehensive income, net of deferred taxes of $0, $1,962, $0 and $3,820, respectively	$ 8,954	$ 12,150	$ 14,982	$ 13,602