Restricted Cash (Schedule Of Restricted Cash) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Aug. 15, 2016	Dec. 31, 2015	Sep. 28, 2012
Restricted Cash and Cash Equivalents Items [Line Items]
Total restricted cash	$ 555,706		$ 28,580
Restricted Cash - Current Asset [Member] | Securitization Escrow Accounts [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Total restricted cash	24,049		25,135
Restricted Cash - Current Asset [Member] | Escrow Account For Payment Of 5.625% Senior Notes [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Total restricted cash	528,128
Restricted Cash - Current Asset [Member] | Payment and Performance Bonds [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Total restricted cash	296		218
Other Assets - Noncurrent [Member] | Surety Bonds and Workers Compensation [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Total restricted cash	$ 3,233		$ 3,227
5.625% Senior Notes [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Debt instrument stated percentage	5.625%	5.625%		5.625%