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Share-Based Compensation Plans - Schedule of activity of stock options and awards of shares and stock units (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares, Beginning Balance	306,726	566,774	1,310,697
Weighted Average Price, Beginning Balance (in dollars per share)	$ 23.42	$ 24.15	$ 18.12
Shares, Granted	0	0	0
Weighted Average Price, Granted (in dollars per share)	$ 0.00	$ 0.00	$ 0.00
Shares, Expired	0	(30,000)	0
Weighted Average Price, Expired (in dollars per share)	$ 0.00	$ 12.09	$ 0.00
Shares, Exercised	(163,726)	(230,048)	(743,923)
Weighted Average Price, Exercised (in dollars per share)	$ 23.73	$ 26.71	$ 13.52
Shares, Ending Balance	143,000	306,726	566,774
Weighted Average Price, Ending Balance (in dollars per share)	$ 23.06	$ 23.42	$ 24.15
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Shares, Beginning Balance	605,488	634,298	610,803
Weighted Average Price, Beginning Balance (in dollars per share)	$ 39.47	$ 34.16	$ 31.17
Shares, Granted	191,936	241,274	176,418
Weighted Average Price, Granted (in dollars per share)	$ 46.86	$ 45.23	$ 43.06
Shares, Forfeited	(965)	(3,587)	(500)
Weighted Average Price, Forfeited (in dollars per share)	$ 43.13	$ 29.56	$ 43.76
Shares, Vested	(304,171)	(266,497)	(152,423)
Weighted Average Price, Vested (in dollars per share)	$ 35.29	$ 32.17	$ 32.46
Shares, Ending Balance	492,288	605,488	634,298
Weighted Average Price, Ending Balance (in dollars per share)	$ 44.93	$ 39.47	$ 34.16

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ 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)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

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-Publisher FASB
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-Subparagraph (c)(2)(iii)(3)
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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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-Publisher FASB
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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ References

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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- Definition

Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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-Publisher FASB
-Name Accounting Standards Codification
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Net number of share options (or share units) granted during the period.

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- Definition

Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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

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