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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	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Restricted Stock Units (RSUs)
Number of Shares
Outstanding at beginning of period (in shares)	501
Granted (in shares)	138
Vested (in shares)	(131)
Forfeited (in shares)	(58)
Outstanding and unvested at end of period (in shares)	450	501
Weighted-Average Grant Date Fair Value
Outstanding and unvested (in dollars per share)	$ 38.90
Granted (in dollars per share)	46.04
Vested (in dollars per share)	34.34
Forfeited (in dollars per share)	38.55
Outstanding and unvested (in dollars per share)	$ 42.45	$ 38.90
Weighted-average remaining years, outstanding and unvested	1 year 3 months 18 days	1 year 6 months
Aggregate Intrinsic Value
Outstanding and unvested at end of period	$ 32,339	$ 24,293
Unrecognized compensation cost	$ 16,000
Weighted average period of compensation cost not yet recognized (in years)	2 years 7 months 6 days
Restricted Stock Awards (RSAs)
Number of Shares
Outstanding at beginning of period (in shares)	23
Granted (in shares)	21
Vested (in shares)	(23)
Forfeited (in shares)	0
Outstanding and unvested at end of period (in shares)	21	23
Weighted-Average Grant Date Fair Value
Outstanding and unvested (in dollars per share)	$ 41.07
Granted (in dollars per share)	46.60
Vested (in dollars per share)	41.07
Forfeited (in dollars per share)	0.00
Outstanding and unvested (in dollars per share)	$ 46.60	$ 41.07
Aggregate Intrinsic Value
Unrecognized compensation cost	$ 600
Weighted average period of compensation cost not yet recognized (in years)	7 months 6 days

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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

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