Description of the Business and Summary of Significant Accounting Policies - Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net Income (Loss) Available to Common Stockholders, Diluted [Abstract]
Net income (loss) available to common shareholders	$ (417,391)	$ 145,794	$ 264,670
Net income (loss) available to common stockholders - assuming dilution	$ (417,391)	$ 145,794	$ 264,670
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Weighted average shares outstanding - basic (in shares)	54,962	51,609	51,294
Effect of dilutive stock-based compensation (in shares)		169	213
Effect of dilutive put rights (in shares)		197
Net income available to common stockholders - assuming dilution (in shares)	54,962	51,975	51,507
Earnings Per Share, Diluted [Abstract]
Net income, per share (in dollars per share)	$ (7.59)	$ 2.82	$ 5.16
Net income, per share - assuming dilution (in dollars per share)	$ (7.59)	$ 2.81	$ 5.14
Anti-dilutive securities excluded from EPS computation	100