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Basis of Presentation and Summary of Significant Accounting Policies - Weighted Average Common Shares Outstanding Used to Calculate Earnings Per Share (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net (loss) income attributable to shareholders	$ (243,638)	$ 99,006	$ 168,295
Weighted average common shares outstanding – Basic (in shares)	43,842	43,316	43,156
Dilutive impact of share based compensation awards (in shares)	0	453	418
Weighted average common shares outstanding – Diluted (in shares)	43,842	43,769	43,574
Antidilutive securities excluded from computation of earnings (in shares)	500
Convertible Debt Securities
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings (in shares)	1,600

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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