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Restructuring Charges (Details) (USD $) | 3 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012
Restructuring Cost and Reserve |  |  |
Restructuring charges | $ 2,206,000 |  | $ 0
Restructuring Reserve [Roll Forward] |  |  |
Balance at December 31, 2012 | 906,000 |  |
Restructuring charges | 2,206,000 |  | 0
Payments | (1,566,000) |  |
Non-cash charge | (653,000) |  |
Balance at March 31, 2013 | 893,000 |  |
Employee Severance |  |  |
Restructuring Cost and Reserve |  |  |
Restructuring charges | 246,000 |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance at December 31, 2012 | 906,000 |  |
Restructuring charges | 246,000 |  |
Payments | (623,000) |  |
Non-cash charge | 0 |  |
Balance at March 31, 2013 | 529,000 |  |
Facilities |  |  |
Restructuring Cost and Reserve |  |  |
Restructuring charges | 1,960,000 |  |
Restructuring Reserve [Roll Forward] |  |  |
Balance at December 31, 2012 | 0 |  |
Restructuring charges | 1,960,000 |  |
Payments | (943,000) |  |
Non-cash charge | (653,000) | [1] |
Balance at March 31, 2013 | 364,000 |  |
Minimum |  |  |
Restructuring Cost and Reserve |  |  |
Company estimate of the aggregate restructuring cost | 6,000,000 |  |
Maximum |  |  |
Restructuring Cost and Reserve |  |  |
Company estimate of the aggregate restructuring cost | $ 10,000,000 |  |
[1] | The non-cash charge of $653 thousand is related to the termination of the Company's financing obligation associated with abandoning a construction asset at one of its facilities.

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