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Common Stock (Schedule of Restricted Stock Unit Activity) (Details) (Restricted Stock Units (RSUs), USD $)
In Thousands, except Per Share data, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Restricted Stock Units (RSUs)
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| Stock Units | |||
| Nonvested as of December 31, 2013 (in shares) | 763 | ||
| Granted (in shares) | 805 | 894 | 1,216 |
| Vested (in shares) | (817) | ||
| Forfeited (in shares) | (49) | ||
| Nonvested as of December 31, 2014 (in shares) | 702 | 763 | |
| Weighted-Average Grant Date Fair Value | |||
| Nonvested as of December 31, 2013 (in dollars per share) | $ 46.06 | ||
| Granted (in dollars per share) | $ 92.28 | $ 57.50 | $ 43.98 |
| Vested (in dollars per share) | $ 71.16 | ||
| Forfeited (in dollars per share) | $ 63.22 | ||
| Nonvested as of December 31, 2014 (in dollars per share) | $ 68.11 | $ 46.06 | |