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Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Condensed Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 19,401	$ 12,985	$ 55,716	$ 25,575
Other comprehensive loss before taxes:
Change in fair value of interest rate swap agreements	(4,239)	(2,202)	(5,902)	(2,183)
Total other comprehensive loss before taxes	(4,239)	(2,202)	(5,902)	(2,183)
Provision for income tax benefit related to components of other comprehensive loss	1,611	837	2,242	830
Other comprehensive loss	(2,628)	(1,365)	(3,660)	(1,353)
Comprehensive income	$ 16,773	$ 11,620	$ 52,056	$ 24,222

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The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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