XML 37 R26.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Earnings per share (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2018
Earnings per share |
Schedule of basic and diluted net income per share | The following table sets forth the computation of basic and diluted net income per share (in thousands, except per share amounts):
|  | Three Months Ended |  | Six Months Ended |  |
|  | June 30, |  | June 30, |  |
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |  |
Net income |  | $ | 68,936 |  | $ | 25,377 |  | $ | 89,295 |  | $ | 46,890 |  |
Less net income allocated to participating securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-forfeitable dividends on participating securities |  |  | (91) |  |  | (92) |  |  | (179) |  |  | (189) |  |
Income allocated to participating securities |  |  | (187) |  |  | (12) |  |  | (187) |  |  | (12) |  |
Total net income allocated to participating securities |  |  | (278) |  |  | (104) |  |  | (366) |  |  | (201) |  |
Net income available to common stockholders |  |  | 68,658 |  |  | 25,273 |  |  | 88,929 |  |  | 46,689 |  |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Participating securities |  |  | 278 |  |  | 104 |  |  | 366 |  |  | 201 |  |
Net income for diluted net income per share |  | $ | 68,936 |  | $ | 25,377 |  | $ | 89,295 |  | $ | 46,890 |  |
Shares for basic net income per share |  |  | 39,471 |  |  | 39,414 |  |  | 39,461 |  |  | 39,390 |  |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options |  |  | 2 |  |  | 11 |  |  | 2 |  |  | 11 |  |
Performance-based stock units |  |  | 132 |  |  | 207 |  |  | 132 |  |  | 207 |  |
Participating securities |  |  | 160 |  |  | 162 |  |  | 155 |  |  | 161 |  |
Total effect of dilutive securities |  |  | 294 |  |  | 380 |  |  | 289 |  |  | 379 |  |
Shares for diluted net income per share |  |  | 39,765 |  |  | 39,794 |  |  | 39,750 |  |  | 39,769 |  |
Basic net income per share |  | $ | 1.74 |  | $ | 0.64 |  | $ | 2.25 |  | $ | 1.19 |  |
Diluted net income per share |  | $ | 1.73 |  | $ | 0.64 |  | $ | 2.25 |  | $ | 1.18 |  |

X
- References No definition available. + Details
Name: | us-gaap_EarningsPerShareAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + 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 + Details
Name: | us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration