Correction of Statement of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	3 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2011 Scenario, Previously Reported [Member]	Sep. 30, 2011 Restatement Adjustment [Member]
Change in trade payables	$ 5,805	$ (2,320)	$ (4,021)	$ (2,320)
Total adjustment to reconcile net income to net cash provided by operating activities	13,093	12,335	10,634	12,335
Net cash provided by operating activities	32,162	30,409	28,708	30,409
Capital expenditures for property and equipment	(49,264)	(38,787)	(37,086)	(38,787)
Net cash used in investing activities	$ (70,621)	$ (48,800)	$ (47,099)	$ (48,800)

The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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