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Notes Payable and Long-Term Debt (Details) (USD $) | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Notes Payable |  |
Notes payable to banks | $ 16,219,000 | $ 78,729,000
Notes payable to bank |  |
Notes Payable |  |
Notes payable to banks | 16,219,000 | 78,729,000
Maximum repayment term (in years) | 1 |
Weighted average interest rate (as a percent) | 9.34% | 5.79%
Letters of credit for outstanding IDRBs | 26,385,000 |
Letters of credit related to insurance coverages | 21,500,000 |
Committed bank line |  |
Notes Payable |  |
Maximum capacity | 300,000,000 |
Letters of credit outstanding | 48,078,000 |
Uncommitted bank lines |  |
Notes Payable |  |
Maximum capacity | 182,966,000 |
Letters of credit outstanding | 25,045,000 |
Uncommitted bank lines | Foreign subsidiaries |  |
Notes Payable |  |
Notes payable to banks | 16,219,000 |
Maximum capacity | 132,966,000 |
Uncommitted bank lines | Foreign subsidiaries | South African Rand |  |
Notes Payable |  |
Notes payable to banks | 11,974,000 |
Term note |  |
Notes Payable |  |
Notes payable to banks |  | $ 45,000,000

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