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Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Determination of shares: |  |  |  |
Weighted-average common shares outstanding (in shares) | 91,468,000 | 90,928,000 | 91,330,000 | 90,840,000
Assumed conversion of dilutive employee stock-based awards (in shares) | 3,319,000 | 2,230,000 | 3,299,000 | 1,629,000
Assumed conversion of restricted stock (in shares) | 208,000 | 81,000 | 205,000 | 74,000
Diluted weighted-average common shares outstanding before participating security | 94,995,000 | 93,239,000 | 94,834,000 | 92,543,000
Anti-dilutive securities, options to purchase shares outstanding | 660,958 | 55,062 | 653,673 | 1,598,500
Calculation of basic EPS: |  |  |  |
Net income applicable to common stock | $ 53,988 | $ 17,079 | $ 99,425 | $ 22,183
Weighted-average common shares outstanding (in shares) | 91,468,000 | 90,928,000 | 91,330,000 | 90,840,000
Basic EPS (in dollars per share) | $ 0.59 | $ 0.19 | $ 1.09 | $ 0.24
Calculation of diluted EPS using two class method: |  |  |  |
Net income applicable to common stock | $ 53,988 | $ 17,079 | $ 99,425 | $ 22,183
Diluted weighted-average common shares outstanding before participating security | 94,995,000 | 93,239,000 | 94,834,000 | 92,543,000
Diluted EPS (in dollars per share) | $ 0.57 | $ 0.18 | $ 1.05 | $ 0.24

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=96948231&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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