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Debt (Details) (USD $) | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Oct. 10, 2013 Credit facility | Sep. 30, 2013 Credit facility | Dec. 31, 2012 Credit facility | Oct. 10, 2013 Letters of credit and bankers' acceptances | Sep. 30, 2013 Letters of credit and bankers' acceptances | Sep. 30, 2013 Term Loans | Dec. 31, 2012 Term Loans | Sep. 30, 2013 Acquisition promissory notes | Dec. 31, 2012 Acquisition promissory notes | Sep. 30, 2013 Other | Dec. 31, 2012 Other
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 1,100,000,000 | $ 800,000,000 |  | $ 400,000,000 | $ 300,000,000 | $ 242,500,000 |  |  |  |  |
Maximum additional borrowings available at the entity's request subject satisfaction of certain conditions |  |  |  |  |  |  | 150,000,000 |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt | 458,645,000 |  | 458,645,000 |  | 380,318,000 |  | 190,000,000 | 100,500,000 |  |  | 242,500,000 | 247,500,000 | 18,070,000 | 25,878,000 | 8,075,000 | 6,440,000
Current maturities of long-term debt | 28,642,000 |  | 28,642,000 |  | 26,065,000 |  |  |  |  |  |  |  |  |  |  |
Long term-debt | 430,003,000 |  | 430,003,000 |  | 354,253,000 |  |  |  |  |  |  |  |  |  |  |
Interest income, expense and other financing costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income | 1,432,000 | 256,000 | 2,357,000 | 781,000 |  |  |  |  |  |  |  |  |  |  |  |
Interest expense and other financing costs | (6,012,000) | (4,561,000) | (15,175,000) | (15,184,000) |  |  |  |  |  |  |  |  |  |  |  |
Interest expense and other financing costs, net | $ (4,580,000) | $ (4,305,000) | $ (12,818,000) | $ (14,403,000) |  |  |  |  |  |  |  |  |  |  |  |

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