Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator (for basic and diluted earnings per share)
Income (loss) from continuing operations before income tax	$ (17,512)	$ 5,798	$ (24,710)	$ 2,478
Income allocated to RSUs	0	98	0	37
Numerator for basic and diluted earnings per share from continuing operations	$ (17,512)	$ 5,700	$ (24,710)	$ 2,441
Denominator
Basic weighted-average shares outstanding	81,418	80,822	81,248	80,748
Effect of dilutive securities:
Restricted stock units	0	374	0	400
Diluted weighted-average shares outstanding	81,418	81,196	81,248	81,148

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Amount after tax of income (loss) from continuing operations attributable to the parent.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities, and addition from assumption of issuance of common shares for dilutive potential common shares; of income (loss) available to common shareholders.

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