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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Net income | $ 3,294 | $ 34,692 | $ 50,139 | $ 98,735
Net income allocated to Class A common stockholders | $ 3,242 | $ 34,692 | $ 49,311 | $ 98,735
Basic weighted-average common shares issued and outstanding (in shares) | 52,275 | 52,588 | 52,084 | 52,818
Basic earnings per common share (in usd per share) | $ 0.06 | $ 0.66 | $ 0.95 | $ 1.87
Earnings Per Share, Diluted [Abstract] |  |  |  |
Net income allocated to Class A common stockholders | $ 3,242 | $ 34,692 | $ 49,311 | $ 98,735
Re-allocated earnings | 1 | 0 | 13 | 0
Diluted net income allocated to Class A common stockholders | $ 3,243 | $ 34,692 | $ 49,324 | $ 98,735
Basic weighted-average common shares issued and outstanding (in shares) | 52,275 | 52,588 | 52,084 | 52,818
Diluted weighted-average Class A shares issued and outstanding (in shares) | 53,164 | 53,811 | 52,913 | 54,154
Diluted earnings per common share (in usd per share) | $ 0.06 | $ 0.64 | $ 0.93 | $ 1.82
Other Classes of Common Stock |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Net income allocated to Class A common stockholders | $ (52) | $ 0 | $ (828) | $ 0
Earnings Per Share, Diluted [Abstract] |  |  |  |
Net income allocated to Class A common stockholders | (52) | 0 | (828) | 0
Common Class A |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Net income allocated to Class A common stockholders | 3,242 | 34,692 | 49,311 | 98,735
Earnings Per Share, Diluted [Abstract] |  |  |  |
Net income allocated to Class A common stockholders | $ 3,242 | $ 34,692 | $ 49,311 | $ 98,735
Stock options |  |  |  |
Earnings Per Share, Diluted [Abstract] |  |  |  |
Dilutive potential common shares (in shares) | 58 | 131 | 57 | 150
Restricted stock units |  |  |  |
Earnings Per Share, Diluted [Abstract] |  |  |  |
Dilutive potential common shares (in shares) | 567 | 456 | 469 | 586
Performance-based restricted stock units |  |  |  |
Earnings Per Share, Diluted [Abstract] |  |  |  |
Dilutive potential common shares (in shares) | 258 | 630 | 299 | 592
Employee stock purchase plan |  |  |  |
Earnings Per Share, Diluted [Abstract] |  |  |  |
Dilutive potential common shares (in shares) | 6 | 6 | 4 | 8

X
- Definition Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise stock options, restrictive stock units (RSUs), convertible preferred stock of an employee stock ownership plan (ESOP), and other dilutive convertible securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121326447&loc=SL5780133-109256 + Details
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