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Stock-Based Compensation - Performance Restricted Stock Units (Details) - PRSUs	12 Months Ended
	Dec. 31, 2018 USD ($) award_vesting_period shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting, period of average award price	30 days
Award vesting, period of average award price, first period	30 days
Award vesting, period of average award price, last period	30 days
Weighted volatility rate	50.00%
Fair value of performance units granted	$ 2,000,000	$ 2,600,000	$ 2,800,000
Granted (in shares) | shares	275,550	293,083	199,168
Number of award vesting periods | award_vesting_period	3
Award vesting period	1 year	3 years	3 years
Stock-based compensation expense	$ 1,200,000	$ 600,000	$ 800,000
Fair value of awards vested	0	$ 200,000	$ 0
Unamortized stock compensation expense	$ 2,000,000
Compensation cost not yet recognized, period for recognition	1 year 10 months 24 days
25th Percentile (Threshold Level)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	50.00%
50th Percentile (Target Level)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	100.00%
75th Percentile (Maximum Level)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	150.00%
90th Percentile (the maximum level for the 2018 grant)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	200.00%

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Share Based Compensation Arrangement By Share Based Award, Award Vesting Period, Average Award Price

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based compensation awards.

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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.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 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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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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