XML 68 R26.htm IDEA: XBRL DOCUMENT v2.4.0.6

Quarterly Results Of Operations (Tables)

12 Months Ended

Dec. 31, 2011

Quarterly Results Of Operations [Abstract]

Schedule Of Quarterly Results Of Operations

		First Quarter				Second Quarter				Third Quarter				Fourth Quarter
2011:
Operating revenues		$	469,429			$	515,897			$	509,587			$	507,937
Operating income			27,442				46,767				50,066				49,399
Net income			16,293				27,518				29,578				29,368
Basic earnings per share			.22				.38				.41				.40
Diluted earnings per share			.22				.38				.40				.40

		First Quarter				Second Quarter				Third Quarter				Fourth Quarter
2010:
Operating revenues		$	425,075			$	463,469			$	463,262			$	463,214
Operating income			18,264				35,546				40,145				40,627
Net income			10,836				20,930				24,158				24,115
Basic earnings per share			.15				.29				.33				.33
Diluted earnings per share			.15				.29				.33				.33

X

- Details

Name:	us-gaap_QuarterlyFinancialInformationDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Topic 270

-SubTopic 10

-Publisher FASB

-Number

-Article

-Subparagraph (a)-(j)

-Name Accounting Standards Codification

-Paragraph 1

-Section 50

-URI http://asc.fasb.org/extlink&oid=6952194&loc=d3e1280-108306

+ Details

Name:	us-gaap_ScheduleOfQuarterlyFinancialInformationTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration