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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
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |
Net income | $ 40,754 | $ 32,882
Income attributable to preferred stock | 0 | (972)
Net income allocated to Class A common stockholders | $ 40,754 | $ 31,910
Weighted-average Class A shares issued and outstanding | 50,458 | 49,863
Basic earnings per Class A common share, in usd per share | $ 0.81 | $ 0.64
Re-allocated earnings | $ 0 | $ 19
Diluted net income allocated to Class A common stockholders | $ 40,754 | $ 31,929
Diluted weighted-average Class A shares issued and outstanding | 52,497 | 50,867
Diluted earnings per Class A common share, in usd per share | $ 0.78 | $ 0.63
Stock Options [Member] |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |
Dilutive potential common shares | 603 | 343
Restricted Stock Units (RSUs) [Member] |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |
Dilutive potential common shares | 1,417 | 630
Employee Stock Purchase Plan [Member] |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |
Dilutive potential common shares | 19 | 31
Common Class A [Member] |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |
Weighted-average Class A shares issued and outstanding | 50,458 | 49,863
Basic earnings per Class A common share, in usd per share | $ 0.81 | $ 0.64
Diluted weighted-average Class A shares issued and outstanding | 52,497 | 50,867
Diluted earnings per Class A common share, in usd per share | $ 0.78 | $ 0.63

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 66 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e2814-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e2740-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 65 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e2793-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60A -URI http://asc.fasb.org/extlink&oid=64863997&loc=SL5780132-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -URI http://asc.fasb.org/extlink&oid=64863997&loc=SL5780133-109256 + Details
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