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Stock-based Compensation (Summary of Restricted Stock Awards Vested) (Details) (USD $)
Share data in Thousands, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Total shares vested | 978 | 1,974 | 1,717 |
| Fair value on vesting date | $ 66,666,000 | $ 101,692,000 | $ 74,754,000 |
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Restricted Stock [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Stock-based compensation expense | 37,800,000 | 32,700,000 | 31,300,000 |
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Restricted Stock Awards [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Unrecognized compensation expense on restricted stock awards | $ 33,200,000 | ||
| Unrecognized compensation expense on restricted stock awards, weighted average period, years | 1 year | ||