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Employee Benefits and Share-Based Compensation - Restricted Stock Activity (Details) - 2009 Plan - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Restricted Stock Units (RSUs)
Number of Shares
Outstanding at beginning of period (in shares)	501
Granted (in shares)	71
Vested (in shares)	(50)
Forfeited (in shares)	(14)
Outstanding and unvested at end of period (in shares)		508	501
Weighted-Average Grant Date Fair Value
Outstanding and unvested (in dollars per share)	$ 38.90
Granted (in dollars per share)	44.32	$ 36.57
Vested (in dollars per share)	33.70
Forfeited (in dollars per share)	$ 39.05
Outstanding and unvested (in dollars per share)		$ 40.16	$ 38.90
Weighted-average remaining years, outstanding and unvested	1 year 6 months		1 year 6 months
Aggregate Intrinsic Value
Outstanding and unvested at end of period		$ 22,041	$ 24,293
Unrecognized compensation cost		17,200
Weighted average period of compensation cost not yet recognized (in years)	2 years 9 months 22 days
Restricted Stock Awards
Number of Shares
Outstanding at beginning of period (in shares)	23
Granted (in shares)	0
Vested (in shares)	0
Forfeited (in shares)	0
Outstanding and unvested at end of period (in shares)	23		23
Weighted-Average Grant Date Fair Value
Outstanding and unvested (in dollars per share)	$ 41.07
Granted (in dollars per share)	0.00
Vested (in dollars per share)	0.00
Forfeited (in dollars per share)	0.00
Outstanding and unvested (in dollars per share)	$ 41.08		$ 41.07
Aggregate Intrinsic Value
Unrecognized compensation cost		$ 100
Weighted average period of compensation cost not yet recognized (in years)	1 month 21 days

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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

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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.

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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).

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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).

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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.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options.

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