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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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 4,573	$ 13,639	$ 104,431	$ 73,659
Basic weighted-average common shares issued and outstanding (in shares)	52,580	50,519	52,046	50,330
Basic earnings per common share (in usd per share)	$ 0.09	$ 0.27	$ 2.01	$ 1.46
Diluted weighted-average Class A shares issued and outstanding (in shares)	54,615	52,923	54,437	52,788
Diluted earnings per common share (in usd per share)	$ 0.08	$ 0.26	$ 1.92	$ 1.40
Stock options
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive potential common shares:	214	790	372	764
Restricted stock units
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive potential common shares:	1,032	1,292	1,223	1,404
Performance based shares
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive potential common shares:	780	306	791	282
Employee stock purchase plan
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive potential common shares:	9	16	5	8

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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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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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