Restructuring Charges (Details) (Severance, USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Severance
Changes in restructuring liability
Balance at the beginning of the period	$ 171	$ 171	$ 297
Severance and related costs	4,169
Cash payments	(3,551)	0	(126)
Non-cash items, modification of share-based award	(130)
Balance at the end of the period	$ 659	$ 171	$ 171

Amount of cash paid in the period to fully or partially settle a specified, previously accrued type of restructuring cost.

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Amount of consideration other than cash paid in the period to fully or partially settle a specified, previously accrued type of restructuring cost.

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- Definition

The charge against earnings in the period for known and estimated costs of termination benefits provided to current employees that are involuntarily terminated under a benefit arrangement associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding costs or losses pertaining to an entity newly acquired in a business combination or a discontinued operation as defined by generally accepted accounting principles and costs associated with one-time termination benefits.

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