XML 60 R45.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Shareholders' Equity (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
Stockholders' Equity Note [Abstract] |
Rollforward of Common Stock Issued and Outstanding | The following table is a summary of changes in common shares issued and outstanding:
| Year ended December 31, | 2017 |  | 2016 |  | 2015 |
| (thousands of shares) |  |  |  |  |  |
| Issued and outstanding shares – January 1 | 41,187 |  |  | 43,701 |  |  | 38,442 |  |
| Issuance of shares | — |  |  | — |  |  | 7,435 |  |
| Repurchase of shares | (1,322 | ) |  | (2,741 | ) |  | (2,473 | ) |
| Exercise of options and issuance of restricted stock awards | 159 |  |  | 227 |  |  | 297 |  |
| Issued and outstanding shares – December 31 | 40,024 |  |  | 41,187 |  |  | 43,701 |  |

X
- Definition Tabular disclosure of the change in common stock outstanding. + References No definition available. + Details
Name: | us-gaap_ScheduleOfCommonStockOutstandingRollForwardTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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