Common Stock and Stock-based Compensation (Details 6) (SARs Activity [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014
Summary of information on SARs outstanding
Number of Outstanding Options (in shares)	968
Weighted average Remaining Life (Years)	4 years 4 months 24 days
Weighted average Exercise Price (in dollars per share)	$ 28.32
Range of Exercise Prices One [Member]
Summary of information on SARs outstanding
SARs Prices, Lower range (in dollars per share)	$ 15.01
SARs Prices, Upper range (in dollars per share)	$ 15.01
Number of Outstanding Options (in shares)	162
Weighted average Remaining Life (Years)	3 years 8 months 12 days
Weighted average Exercise Price (in dollars per share)	$ 15.01
Summary of information on SARs outstanding
SARs exercise price (in dollars per share)	$ 15.01
Range of Exercise Prices Two [Member]
Summary of information on SARs outstanding
SARs Prices, Lower range (in dollars per share)	$ 21.24
SARs Prices, Upper range (in dollars per share)	$ 24.03
Number of Outstanding Options (in shares)	140
Weighted average Remaining Life (Years)	4 years 4 months 24 days
Weighted average Exercise Price (in dollars per share)	$ 21.40
Summary of information on SARs outstanding
SARs exercise price (in dollars per share)	$ 21.24
Range of Exercise Prices Three [Member]
Summary of information on SARs outstanding
SARs Prices, Lower range (in dollars per share)	$ 27.78
SARs Prices, Upper range (in dollars per share)	$ 29.45
Number of Outstanding Options (in shares)	337
Weighted average Remaining Life (Years)	4 years 6 months
Weighted average Exercise Price (in dollars per share)	$ 28.90
Summary of information on SARs outstanding
SARs exercise price (in dollars per share)	$ 24.03
Range of Exercise Prices Four [Member]
Summary of information on SARs outstanding
SARs Prices, Lower range (in dollars per share)	$ 33.30
SARs Prices, Upper range (in dollars per share)	$ 34.0
Number of Outstanding Options (in shares)	146
Weighted average Remaining Life (Years)	6 years 3 months 18 days
Weighted average Exercise Price (in dollars per share)	$ 33.32
Summary of information on SARs outstanding
SARs exercise price (in dollars per share)	$ 27.78
Range of Exercise Prices Five [Member]
Summary of information on SARs outstanding
SARs Prices, Lower range (in dollars per share)	$ 39.30
SARs Prices, Upper range (in dollars per share)	$ 44.72
Number of Outstanding Options (in shares)	183
Weighted average Remaining Life (Years)	3 years 1 month 6 days
Weighted average Exercise Price (in dollars per share)	$ 40.41
Summary of information on SARs outstanding
SARs exercise price (in dollars per share)	$ 34.70

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

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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.

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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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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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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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