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Stock-Based Incentive Plans - Stock Option Activity (Details) - Non-Qualified Stock Options - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Shares
Exercisable at the start of the period (in shares)	251
Exercised (in shares)	(120)
Forfeited (in shares)	0
Exercisable at the end of the period (in shares)	131	251
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted-average exercise price at beginning of the period (in dollars per share)	$ 29.66
Weighted-average exercise price at end of the period (in dollars per share)	$ 29.66	$ 29.66
Weighted-average remaining contractual life	3 months 8 days	1 year 1 month 12 days
Outstanding at the end of the period (in dollars)	$ 2,534	$ 3,558
Closing price per share (in dollars per share)	$ 49.04

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- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise prices of stock awards outstanding.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Price of a single share of a number of saleable stocks of a company.

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

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Number of share options (or share units) exercised during the current period.

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