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Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Commitments and Contingencies |  |  |
Rental expense | $ 7,300 | $ 7,100 | $ 6,600
Minimum rental commitments |  |  |
2012 | 5,109 |  |
2013 | 3,316 |  |
2014 | 2,437 |  |
2015 | 1,982 |  |
2016 | 1,497 |  |
Thereafter | 1,659 |  |
Minimum rental commitments under all non-cancelable leases | 16,000 |  |
Future minimum commitments |  |  |
2012 | 16,487 |  |
2013 | 1,391 |  |
2014 | 491 |  |
Total commitments | 18,369 |  |
Purchase Obligations |  |  |
Future minimum commitments |  |  |
2012 | 16,354 |  |
2013 | 1,391 |  |
2014 | 491 |  |
Total commitments | 18,236 |  |
Debt Interest Obligations |  |  |
Future minimum commitments |  |  |
2012 | 133 |  |
Total commitments | $ 133 |  |

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- Definition The total of future contractually required payments on leases defined as operating. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 122 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 16 -Subparagraph b(i) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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