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Commitments and Contingencies (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 21, 2011 claim | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Commitments And Contingencies [Line Items] |  |  |  |
Rent expense under operating leases |  | $ 116,541 | $ 97,587 | $ 103,416
Document Fiscal Year Focus |  | 2013 |  |
Loss Contingency, New Claims Filed, Number | 2 |  |  |
Loss Contingency, Damages Sought, Multiple | 3 |  |  |
Standby Letters of Credit Related to Various Insurance Contracts and Foreign Vendor Commitments [Member] | Senior Secured Credit Facility [Member] |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Standby letters of credit for various insurance contracts and commitments to foreign vendors |  | $ 47,713 | $ 50,540 |
Maximum [Member] | Standby Letters of Credit Related to Various Insurance Contracts and Foreign Vendor Commitments [Member] | Senior Secured Credit Facility [Member] |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |
Expiration period for standby letters of credit |  | 2 years |  |

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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