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Employee Benefit Plans (Narrative) (Details) (USD $)
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3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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| Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] | ||||
| Expenses relating to defined contribution plans | $ 6,200,000 | $ 4,600,000 | $ 16,700,000 | $ 13,900,000 |
| Contributions to pension plan | 5,300,000 | |||
| Estimated future employer contributions, current fiscal year | $ 0 | $ 0 | ||