v3.5.0.2

Earnings Per Share (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2016
Earnings Per Share [Abstract] |
Components of Basic and Diluted Earnings Per Share | The components of basic and diluted earnings per share for the quarter and six months ended June 30, 2016 and 2015 are as follows:
|  | Quarter Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |
|  | (Thousands of dollars) |
Weighted average outstanding shares of common stock, basic |  |  | 15,677 |  |  |  | 15,574 |  |  |  | 15,650 |  |  |  | 15,574 |
Dilutive effect of unvested restricted stock units |  |  | 41 |  |  |  | 116 |  |  |  | — |  |  |  | 105 |
Weighted average outstanding shares of common stock, diluted (1) |  |  | 15,718 |  |  |  | 15,690 |  |  |  | 15,650 |  |  |  | 15,679 |
(1) | For the six months ended June 30, 2016, 3,180 unvested restricted stock units were excluded from the weighted average outstanding shares of common stock, diluted, as they were anti-dilutive to earnings per share.

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 the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + 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_ScheduleOfWeightedAverageNumberOfSharesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration