Supplementary Cash Flow Disclosures (Schedule Of Supplemental Cash Flow Information) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Supplemental Cash Flow Information [Abstract]
Interest paid	$ 81,577us-gaap_InterestPaid	$ 94,941us-gaap_InterestPaid	$ 66,365us-gaap_InterestPaid
Income taxes paid (refunded), all related to PRT	(21,519)us-gaap_IncomeTaxesPaidNet	57,132us-gaap_IncomeTaxesPaidNet	426us-gaap_IncomeTaxesPaidNet
Reorganization items paid	$ 5,432end_ReorganizationItemsPaid

The amount of cash paid for interest during the period.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585

Name:	us-gaap_InterestPaid
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration