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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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 29,827	$ 19,266	$ 99,858	$ 60,020
Weighted-average Class A shares issued and outstanding	52,105	50,013	51,774	50,234
Basic earnings per Class A common share, in usd per share	$ 0.57	$ 0.39	$ 1.93	$ 1.19
Diluted weighted-average Class A shares issued and outstanding	54,390	52,452	54,301	52,577
Diluted earnings per Class A common share, in usd per share	$ 0.55	$ 0.37	$ 1.84	$ 1.14
Stock Options [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive potential common shares	343	759	441	706
Restricted Stock Units (RSUs) [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive potential common shares	1,236	1,418	1,296	1,368
Performance Shares [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive potential common shares	705	259	789	268
Employee Stock Purchase Plan [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive potential common shares	1	3	1	1

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

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