Common Stock and Stock-based Compensation (Details 6) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2012
SARs Activity [Member]
Summary of information on SARs outstanding
Number of Outstanding Options	993
Weighted average Remaining Life (Years)	5 years 10 months 24 days
Weighted average Exercise Price	$ 24.80
Range of Exercise Prices One [Member]
Summary of information on SARs outstanding
SARs Prices, Lower range	$ 5.55
SARs Prices, Upper range	$ 8.10
Range of Exercise Prices One [Member] \| SARs Activity [Member]
Summary of information on SARs outstanding
SARs Prices, Lower range	$ 0.00
SARs Prices, Upper range	$ 15.01
Number of Outstanding Options	316
Weighted average Remaining Life (Years)	6 years 1 month 6 days
Weighted average Exercise Price	$ 15.01
Summary of information on SARs outstanding
Number of Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$ 15.01
Range of Exercise Prices Two [Member]
Summary of information on SARs outstanding
SARs Prices, Lower range	$ 14.80
SARs Prices, Upper range	$ 16.10
Range of Exercise Prices Two [Member] \| SARs Activity [Member]
Summary of information on SARs outstanding
SARs Prices, Lower range	$ 21.24
SARs Prices, Upper range	$ 24.03
Number of Outstanding Options	272
Weighted average Remaining Life (Years)	6 years 2 months 12 days
Weighted average Exercise Price	$ 21.86
Summary of information on SARs outstanding
Number of Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$ 24.03
Range of Exercise Prices Three [Member]
Summary of information on SARs outstanding
SARs Prices, Lower range	$ 17.075
SARs Prices, Upper range	$ 17.58
Range of Exercise Prices Three [Member] \| SARs Activity [Member]
Summary of information on SARs outstanding
SARs Prices, Lower range	$ 27.78
SARs Prices, Upper range	$ 29.45
Number of Outstanding Options	214
Weighted average Remaining Life (Years)	5 years 3 months 18 days
Weighted average Exercise Price	$ 29.23
Summary of information on SARs outstanding
Number of Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$ 27.78
Range of Exercise Prices Five [Member]
Summary of information on SARs outstanding
SARs Prices, Lower range	$ 34.30
SARs Prices, Upper range	$ 39.30
Range of Exercise Prices Five [Member] \| SARs Activity [Member]
Summary of information on SARs outstanding
Number of Outstanding Options	152
Weighted average Remaining Life (Years)	5 years 3 months 18 days
Weighted average Exercise Price	$ 39.19
Range of Exercise Prices Six [Member] \| SARs Activity [Member]
Summary of information on SARs outstanding
SARs Prices, Lower range	$ 0.00
SARs Prices, Upper range	$ 44.72
Number of Outstanding Options	39
Weighted average Remaining Life (Years)	4 years 1 month 6 days
Weighted average Exercise Price	$ 44.72
Summary of information on SARs outstanding
Number of Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$ 44.72

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- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

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- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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- Definition

Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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