Description of the Business and Summary of Significant Accounting Policies (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Other current assets:
Other current receivables	$ 15,326	$ 15,435
Income tax receivable	0	2,395
Prepaid expenses	22,424	20,241
Inventories	10,762	10,877
Other current assets	26	44
Total other current assets	48,538	48,992
Other long-term assets:
Deferred software costs, net	17,685	22,086
Supplemental deferred compensation plan assets	13,892	13,422
Other	19,136	15,557
Total other long-term assets	50,713	51,065
Accounts payable and accrued liabilities of continuing operations
Trade accounts payable	13,871	17,759
Accrued construction in progress	7,506	8,914
Property and other taxes payable	28,939	24,539
Deferred revenues	44,611	39,454
Accrued salaries and benefits	29,566	30,296
Accrued self-insurance reserves	8,898	8,603
Accrued interest payable	5,589	11,422
Other accrued liabilities	29,995	34,356
Total accounts payable and accrued liabilities	168,975	175,343
Other Long-Term Liabilities
Pension and postretirement benefits liability	68,386	45,028
Straight-line lease liability	62,570	56,757
Deferred compensation liability	13,892	13,422
Unrealized tax benefits	14,141	18,952	16,123	12,417
Other	7,220	8,041
Total other long-term liabilities	$ 166,209	$ 142,200