XML 37 R23.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Earnings Per Share (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2014
Earnings Per Share (Tables) [Abstract] |
Earnings Per Share | Basic and diluted earnings per common share were calculated as follows (in thousands, except per share data):
| Three Months Ended March 31, 2014
| Net Earnings |  | Weighted Average Shares |  | Per Share
Basic earnings per common share | $ | 28,857 |  |  | 52,795 |  |  | $ | 0.55 |
Effect of dilutive stock awards | — |  |  | 225 |  |  |
Diluted earnings per common share | $ | 28,857 |  |  | 53,020 |  |  | $ | 0.54 |
| Three Months Ended March 31, 2013
| Net Earnings |  | Weighted Average Shares |  | Per Share
Basic earnings per common share | $ | 46,133 |  |  | 57,947 |  |  | $ | 0.80 |
Effect of dilutive stock awards | — |  |  | 388 |  |  |
Diluted earnings per common share | $ | 46,133 |  |  | 58,335 |  |  | $ | 0.79 |

X
- Details
Name: | na_EarningsPerShareTablesAbstract
Namespace Prefix: | na_
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