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Earnings per Common Share - Basic Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ (531)	$ 4,573	$ 98,204	$ 104,431
Basic weighted-average common shares issued and outstanding (in shares)	51,595	52,580	52,405	52,046
Basic earnings per common share (in usd per share)	$ (0.01)	$ 0.09	$ 1.87	$ 2.01
Diluted weighted-average Class A shares issued and outstanding (in shares)	52,295	54,615	53,474	54,437
Diluted earnings per common share (in usd per share)	$ (0.01)	$ 0.08	$ 1.84	$ 1.92
Stock options
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive potential common shares (in shares)	83	214	130	372
Restricted stock units
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive potential common shares (in shares)	199	1,032	463	1,223
Performance-based restricted stock units
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive potential common shares (in shares)	373	780	413	791
Employee stock purchase plan
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive potential common shares (in shares)	45	9	63	5

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The earnings attributable to each security on the basis that all of the earnings for the period had been distributed (to the extent that each security may share in earnings). This is the earnings amount which reflects the participation rights in undistributed earnings of each security.

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