Note 14 - Senior Notes (Details) - Carrying Amount of Senior Notes - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Note 14 - Senior Notes (Details) - Carrying Amount of Senior Notes [Line Items]
Senior Notes	$ 846,752	$ 846,450
5.625% Senior Notes Due 2020 [Member]
Note 14 - Senior Notes (Details) - Carrying Amount of Senior Notes [Line Items]
Senior Notes	246,752	246,450
5.5% Senior Notes Due 2024 [Member]
Note 14 - Senior Notes (Details) - Carrying Amount of Senior Notes [Line Items]
Senior Notes	250,000	250,000
6.000% Senior Notes Due January 2043 [Member]
Note 14 - Senior Notes (Details) - Carrying Amount of Senior Notes [Line Items]
Senior Notes	$ 350,000	$ 350,000

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant