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Summary of Significant Accounting Policies - Deferred Charges (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2011
years
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Dec. 31, 2010
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Dec. 31, 2009
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| Summary of Significant Accounting Policies [Abstract] | |||
| Deferred Charges Useful Life | 5 | ||
| Deferred Lease Costs Capitalized | $ 10.7 | $ 6.1 | $ 4.3 |
| X | ||||||||||
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- Definition
Deferred Charges Useful Life - Deferred charges are amortized over the average minimum lease term. No definition available.
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| X | ||||||||||
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- Definition
Deferred Lease Costs Capitalized - Deferred Lease Costs Capitalized during the period include internal lease costs and amounts paid to third-party brokers. No definition available.
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| X | ||||||||||
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- Details
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