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Basis of presentation and summary of significant accounting policies (Details 2) (USD $)
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3 Months Ended | 6 Months Ended | ||
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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| Changes in accumulated other comprehensive loss by component | ||||
| Balance at beginning of period | $ 9,400,000 | |||
| Other comprehensive loss: | ||||
| Foreign currency translation adjustments | (18,000,000) | (13,900,000) | (30,100,000) | 3,300,000 |
| Net change from periodic revaluations | 100,000 | 200,000 | 400,000 | 500,000 |
| Tax benefit | 600,000 | (5,300,000) | (1,900,000) | (22,200,000) |
| Total Other comprehensive income (loss) | (17,300,000) | (14,200,000) | (29,100,000) | 3,300,000 |
| Balance at end of period | (19,500,000) | (19,500,000) | ||
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Foreign currency translation
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| Changes in accumulated other comprehensive loss by component | ||||
| Balance at beginning of period | 600,000 | 13,800,000 | 12,700,000 | (3,400,000) |
| Other comprehensive loss: | ||||
| Foreign currency translation adjustments | (18,000,000) | (13,900,000) | 30,100,000 | 3,300,000 |
| Balance at end of period | (17,400,000) | (100,000) | (17,400,000) | (100,000) |
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Cash flow hedges
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| Changes in accumulated other comprehensive loss by component | ||||
| Balance at beginning of period | (1,100,000) | (1,100,000) | (1,400,000) | (1,400,000) |
| Other comprehensive loss: | ||||
| Net change from periodic revaluations | 1,000,000 | (800,000) | 1,000,000 | (800,000) |
| Tax (expense) benefit | (400,000) | 300,000 | (400,000) | 300,000 |
| Total Other comprehensive income (loss) before reclassifications, net of tax | 600,000 | (500,000) | 600,000 | (500,000) |
| Tax benefit | 200,000 | 100,000 | 200,000 | 300,000 |
| Total amount reclassified from Accumulated other comprehensive loss, net of tax | 100,000 | 200,000 | 400,000 | 500,000 |
| Total Other comprehensive income (loss) | 700,000 | (300,000) | 100,000 | |
| Balance at end of period | (400,000) | (1,400,000) | (400,000) | (1,400,000) |
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Cash flow hedges | Amount reclassified from accumulated other comprehensive income
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| Other comprehensive loss: | ||||
| Net amount reclassified to earnings: | 300,000 | 300,000 | 600,000 | 800,000 |
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Cash flow hedges | Amount reclassified from accumulated other comprehensive income | Interest rate swaps
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| Other comprehensive loss: | ||||
| Net amount reclassified to earnings: | 400,000 | 300,000 | 800,000 | 800,000 |
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Cash flow hedges | Amount reclassified from accumulated other comprehensive income | Fuel commodity swaps
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| Other comprehensive loss: | ||||
| Net amount reclassified to earnings: | $ (100,000) | $ (200,000) | ||