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Notes Payable and Long-Term Debt (Details) (USD $) | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 Notes payable to bank | Dec. 31, 2011 Notes payable to bank | Feb. 23, 2013 Committed bank line | Dec. 31, 2012 Committed bank line | Jun. 30, 2012 Committed bank line | Dec. 31, 2012 Uncommitted bank lines | Dec. 31, 2012 Uncommitted bank lines Foreign subsidiaries | Dec. 31, 2012 Uncommitted bank lines Foreign subsidiaries South African Rand | Dec. 31, 2012 IDRBs
Notes Payable |  |  |  |  |  |  |  |  |
Notes payable to banks | $ 28,786,000 | $ 16,219,000 |  |  |  |  | $ 28,786,000 | $ 23,732,000 |
Repayment term | 1 year |  |  |  |  |  |  |  |
Maximum capacity |  |  | 200,000,000 | 200,000,000 | 300,000,000 | 199,208,000 | 149,208,000 |  |
Current borrowing capacity |  |  |  |  | 200,000,000 |  |  |  |
Weighted average interest rate (as a percent) | 7.45% | 9.34% |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  | 39,960,000 |  | 3,988,000 |  |  |
Letters of credit for outstanding IDRBs | 18,397,000 |  |  |  |  |  |  |  |
Letters of credit related to various insurance coverage | 21,801,000 |  |  |  |  |  |  |  |
Current maturities of long-term debt |  |  |  |  |  |  |  |  | $ 13,000,000

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