Stock-Based Compensation (Details 3) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 17,200	$ 16,654	$ 12,362
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 6,300	$ 7,100	$ 5,900
Restricted Stock Service Based
Summary of non-vested stock options
Non-vested Shares, Beginning Balance (in shares)	1,104
Shares Granted (in shares)	759
Shares Vested (in shares)	(475)
Shares Forfeited (in shares)	(32)
Non-vested Shares, Ending Balance (in shares)	1,356	1,104
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted average fair value, Beginning Balance (usd per share)	$ 22.59
Weighted average fair value, Granted (usd per share)	29.45
Weighted average fair value, Vested (usd per share)	23.87
Weighted average fair value, Forfeited (usd per share)	27.20
Weighted average fair value, Ending Balance (usd per share)	$ 25.87	$ 22.59
Restricted Stock Units Service Based
Summary of non-vested stock options
Non-vested Shares, Beginning Balance (in shares)	65
Shares Granted (in shares)	64
Shares Vested (in shares)	(71)
Shares Forfeited (in shares)	0
Non-vested Shares, Ending Balance (in shares)	58	65
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted average fair value, Beginning Balance (usd per share)	$ 23.36
Weighted average fair value, Granted (usd per share)	27.69
Weighted average fair value, Vested (usd per share)	23.90
Weighted average fair value, Forfeited (usd per share)	0.00
Weighted average fair value, Ending Balance (usd per share)	$ 27.48	$ 23.36

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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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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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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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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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.

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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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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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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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