Acquisitions (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Nov. 15, 2012 Acquisition Sub [Member]
Summary of the preliminary purchase price and purchase price allocation based on the fair value of net assets acquired
Cash			$ 19,000
Financing obligations assumed	196,008		110,243
Purchase price			129,243
Working capital adjustment			3,037
Accounts receivable	6,555	4,985	514
Inventory	4,186	2,955	464
Other current assets			1,329
Property and equipment	814,750	713,453	94,523
Deferred tax assets			14,418
Current Liabilities			(8,878)
Other Liabilities			(6,580)
Net assets acquired			95,790
Goodwill			36,490
Total purchase price			$ 132,280

Acquisition purchase price allocation assets acquired liabilities assumed gross.

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Business acquisition purchase price allocation net assets acquired.

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Business acquisition working capital adjustment paid.

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Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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The total purchase price of the acquired entity. This includes cash paid to equity interest holders of the acquired entity, fair value of debt and equity securities issued to equity holders of the acquired entity, and transaction costs paid to third parties to consummate the acquisition.

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The amount of cash and cash equivalents acquired in a business combination.

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The amount of acquisition cost of a business combination allocated to prepaid expenses and other current assets. Does not include amounts allocated to cash and cash equivalents, marketable securities, receivables, inventory, and assets not to be used.

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The amount of acquisition cost of a business combination allocated to current liabilities of the acquired entity.

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The amount of acquisition cost of a business combination allocated to other current liabilities of the acquired entity. Does not include amounts allocated to the current portion of long-term debt, accounts payable and accrued expenses.

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Gross amount of acquisition cost of a business combination allocated to noncurrent deferred tax assets.

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Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

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Carrying amount (lower of cost or market) as of the balance sheet date of inventories less all valuation and other allowances. Excludes noncurrent inventory balances (expected to remain on hand past one year or one operating cycle, if longer).

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Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations due to be paid more than one year after the balance sheet date.

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Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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