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Restricted Cash (Schedule Of Cash, Cash Equivalents And Restricted Cash) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Restricted Cash And Cash Equivalents Items [Line Items]        
Cash and cash equivalents $ 132,222 $ 146,109    
Restricted cash - short term 30,674 36,786    
Total cash, cash equivalents, and restricted cash 165,471 185,970 $ 131,633 $ 146,619
Securitization Escrow Accounts [Member] | Restricted Cash - Current Asset [Member]        
Restricted Cash And Cash Equivalents Items [Line Items]        
Restricted cash - short term 30,487 36,607    
Payment and Performance Bonds [Member] | Restricted Cash - Current Asset [Member]        
Restricted Cash And Cash Equivalents Items [Line Items]        
Restricted cash - short term 187 179    
Surety Bonds and Workers Compensation [Member] | Other Assets - Noncurrent [Member]        
Restricted Cash And Cash Equivalents Items [Line Items]        
Restricted cash - long term $ 2,575 $ 3,075