Other Balance Sheet Items Other balance Sheet items (Other long-term assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Balance Sheet Related Disclosures [Abstract]
Income Taxes Receivable, Noncurrent	$ 5,811	$ 5,811
Long-term Investments	413	413
Deferred Finance Costs, Noncurrent, Net	11,516	11,830
Restricted Cash and Cash Equivalents, Noncurrent	4,509	3,922
Security Deposit	3,076	2,680
Total other long-term assets	$ 25,325	$ 24,656

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Net amount of long-term deferred finance costs capitalized at the end of the reporting period.

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Carrying amount due after one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes.

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The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle).

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Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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Cash and equivalents whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements.

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The amount of an asset, typically cash, provided to a counterparty to provide certain assurance of performance by the entity pursuant to the terms of a written or oral agreement, such as a lease.

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