Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable within one year (or the operating cycle, if longer). Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

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-Publisher FASB
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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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 exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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

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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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Stock-Based Compensation (Details 2) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Deferred Compensation Liability, Current	$ 0.0	$ 1.0	$ 0.0
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options	$ 0.5	$ 0.3	$ 0.1
$8.18 - $9.55 Range [Member]
Summarized information about outstanding and exercisable stock option
Range of exercise prices, Lower limit	$ 8.18
Range of exercise prices, Upper limit	$ 9.55
Shares outstanding	816
Weighted average remaining contractual price	1 year 3 months 18 days
Weighted average exercise price	$ 8.30
Shares exercisable	484
Weighted average exercise price	$ 8.35
$10.49 - $17.80 Range [Member]
Summarized information about outstanding and exercisable stock option
Range of exercise prices, Lower limit	10.49
Range of exercise prices, Upper limit	$ 17.80
Shares outstanding	925
Weighted average remaining contractual price	2 years 10 months 13 days
Weighted average exercise price	$ 13.55
Shares exercisable	302
Weighted average exercise price	$ 10.58
$18.77 - $22.70 Range [Member]
Summarized information about outstanding and exercisable stock option
Range of exercise prices, Lower limit	18.77
Range of exercise prices, Upper limit	$ 22.70
Shares outstanding	862
Weighted average remaining contractual price	3 years 18 days
Weighted average exercise price	$ 21.84
Shares exercisable	65
Weighted average exercise price	$ 21.21
$23.40-27.33 Range [Member]
Summarized information about outstanding and exercisable stock option
Range of exercise prices, Lower limit	23.40
Range of exercise prices, Upper limit	$ 27.33
Shares outstanding	284
Weighted average remaining contractual price	2 years 3 months 4 days
Weighted average exercise price	$ 24.22
Shares exercisable	112
Weighted average exercise price	$ 23.49